{"id":1694,"date":"2026-04-11T23:24:11","date_gmt":"2026-04-11T23:24:11","guid":{"rendered":"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/"},"modified":"2026-04-11T23:24:11","modified_gmt":"2026-04-11T23:24:11","slug":"myth-busting-entity-relationship-diagrams","status":"publish","type":"post","link":"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/","title":{"rendered":"B\u00f3c t\u00e1ch C\u00e1c Huy\u1ec1n Tho\u1ea1i V\u1ec1 S\u01a1 \u0110\u1ed3 Quan H\u1ec7 Th\u1ef1c Th\u1ec3: T\u00e1ch Bi\u1ec7t Ti\u1ebfp Th\u1ecb Nh\u00e0 Cung C\u1ea5p V\u1edbi Th\u1ef1c T\u1ebf C\u01a1 S\u1edf D\u1eef Li\u1ec7u"},"content":{"rendered":"

S\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 (ERD) n\u1eb1m \u1edf n\u1ec1n t\u1ea3ng c\u1ee7a ki\u1ebfn tr\u00fac d\u1eef li\u1ec7u v\u1eefng ch\u1eafc. Ch\u00fang cung c\u1ea5p b\u1ea3n v\u1ebd tr\u1ef1c quan v\u1ec1 c\u00e1ch th\u00f4ng tin \u0111\u01b0\u1ee3c c\u1ea5u tr\u00fac, l\u01b0u tr\u1eef v\u00e0 truy c\u1eadp trong h\u1ec7 th\u1ed1ng c\u01a1 s\u1edf d\u1eef li\u1ec7u. D\u00f9 c\u00f3 t\u1ea7m quan tr\u1ecdng then ch\u1ed1t, b\u1ed1i c\u1ea3nh xung quanh thi\u1ebft k\u1ebf ERD th\u01b0\u1eddng b\u1ecb che khu\u1ea5t b\u1edfi nh\u1eefng c\u00e2u chuy\u1ec7n ti\u1ebfp th\u1ecb. C\u00e1c nh\u00e0 cung c\u1ea5p v\u00e0 chuy\u00ean gia t\u01b0 v\u1ea5n th\u01b0\u1eddng tr\u00ecnh b\u00e0y c\u00e1c c\u00f4ng c\u1ee5 v\u1ebd s\u01a1 \u0111\u1ed3 nh\u01b0 m\u1ed9t gi\u1ea3i ph\u00e1p th\u1ea7n k\u1ef3, gi\u1ea3i quy\u1ebft ngay l\u1eadp t\u1ee9c nh\u1eefng th\u00e1ch th\u1ee9c ph\u1ee9c t\u1ea1p trong m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u. C\u00e1ch ti\u1ebfp c\u1eadn n\u00e0y b\u1ecf qua logic nghi\u00eam ng\u1eb7t c\u1ea7n thi\u1ebft \u0111\u1ec3 x\u00e2y d\u1ef1ng m\u1ed9t m\u00f4i tr\u01b0\u1eddng d\u1eef li\u1ec7u b\u1ec1n v\u1eefng.<\/p>\n

\u0110\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng t\u1ed3n t\u1ea1i l\u00e2u d\u00e0i, ch\u00fang ta ph\u1ea3i v\u01b0\u1ee3t qua nh\u1eefng l\u1eddi qu\u1ea3ng c\u00e1o hoa m\u1ef9. Ch\u00fang ta c\u1ea7n hi\u1ec3u r\u00f5 th\u1ef1c t\u1ebf k\u1ef9 thu\u1eadt v\u1ec1 c\u00e1c m\u1ed1i quan h\u1ec7, r\u00e0ng bu\u1ed9c v\u00e0 chu\u1ea9n h\u00f3a. H\u01b0\u1edbng d\u1eabn n\u00e0y ph\u00e2n t\u00edch nh\u1eefng hi\u1ec3u l\u1ea7m ph\u1ed5 bi\u1ebfn v\u1ec1 ERD. Ch\u00fang ta s\u1ebd kh\u00e1m ph\u00e1 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa m\u00f4 h\u00ecnh l\u00fd thuy\u1ebft v\u00e0 tri\u1ec3n khai th\u1ef1c t\u1ebf. M\u1ee5c ti\u00eau kh\u00f4ng ph\u1ea3i l\u00e0 qu\u1ea3ng b\u00e1 m\u1ed9t c\u00f4ng c\u1ee5 hay ph\u01b0\u01a1ng ph\u00e1p c\u1ee5 th\u1ec3 n\u00e0o, m\u00e0 l\u00e0 l\u00e0m r\u00f5 c\u00e1c nguy\u00ean t\u1eafc chi ph\u1ed1i t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u.<\/p>\n

\n
\"Hand-drawn<\/figure>\n<\/div>\n

1. V\u0169ng B\u1eaby Tr\u1ef1c Quan: ERD C\u00f3 Ch\u1ec9 L\u00e0 M\u1ed9t S\u01a1 \u0110\u1ed3 Kh\u00f4ng? \ud83c\udfa8<\/h2>\n

M\u1ed9t trong nh\u1eefng hi\u1ec3u l\u1ea7m ph\u1ed5 bi\u1ebfn nh\u1ea5t cho r\u1eb1ng s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 ch\u1ec9 l\u00e0 m\u1ed9t t\u00e0i li\u1ec7u t\u00e0i li\u1ec7u h\u00f3a. Nhi\u1ec1u nh\u00f3m coi s\u01a1 \u0111\u1ed3 nh\u01b0 m\u1ed9t s\u1ea3n ph\u1ea9m \u0111\u1ea7u ra sau d\u1ef1 \u00e1n, th\u1ee9 \u0111\u01b0\u1ee3c t\u1ea1o ra sau khi m\u00e3 ngu\u1ed3n \u0111\u00e3 \u0111\u01b0\u1ee3c vi\u1ebft \u0111\u1ec3 \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u c\u1ee7a c\u00e1c b\u00ean li\u00ean quan. Quan \u0111i\u1ec3m n\u00e0y l\u00e0 sai l\u1ec7ch c\u0103n b\u1ea3n. M\u1ed9t ERD l\u00e0 m\u1ed9t h\u1ee3p \u0111\u1ed3ng logic, ch\u1ee9 kh\u00f4ng ph\u1ea3i ch\u1ec9 l\u00e0 m\u1ed9t b\u1ee9c tranh.<\/p>\n

Khi ERD b\u1ecb coi l\u00e0 m\u1ed9t suy ngh\u0129 cu\u1ed1i c\u00f9ng v\u1ec1 m\u1eb7t tr\u1ef1c quan, th\u00ec m\u1ed9t s\u1ed1 r\u1ee7i ro s\u1ebd n\u1ea3y sinh:<\/p>\n

    \n
  • S\u1ef1 l\u1ec7ch chu\u1ea9n c\u1ea5u tr\u00fac:<\/strong> C\u1ea5u tr\u00fac c\u01a1 s\u1edf d\u1eef li\u1ec7u l\u1ec7ch kh\u1ecfi thi\u1ebft k\u1ebf ban \u0111\u1ea7u, d\u1eabn \u0111\u1ebfn vi\u1ec7c nh\u1eadp d\u1eef li\u1ec7u kh\u00f4ng nh\u1ea5t qu\u00e1n.<\/li>\n
  • C\u00e1c \u0111i\u1ec3m ngh\u1ebdn hi\u1ec7u su\u1ea5t:<\/strong> C\u00e1c truy v\u1ea5n th\u1ea5t b\u1ea1i v\u00ec c\u1ea5u tr\u00fac n\u1ec1n t\u1ea3ng kh\u00f4ng h\u1ed7 tr\u1ee3 c\u00e1c thao t\u00e1c n\u1ed1i (join) m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/li>\n
  • M\u1ea5t m\u00e1t to\u00e0n v\u1eb9n d\u1eef li\u1ec7u:<\/strong> C\u00e1c r\u00e0ng bu\u1ed9c kh\u00f3a ngo\u1ea1i b\u1ecb b\u1ecf qua, cho ph\u00e9p t\u1ed3n t\u1ea1i c\u00e1c b\u1ea3n ghi b\u1ecb b\u1ecf r\u01a1i.<\/li>\n<\/ul>\n

    H\u00e3y xem x\u00e9t v\u00f2ng \u0111\u1eddi c\u1ee7a m\u1ed9t b\u1ea3ng c\u01a1 s\u1edf d\u1eef li\u1ec7u. N\u00f3 b\u1eaft \u0111\u1ea7u t\u1eeb m\u1ed9t y\u00eau c\u1ea7u kinh doanh. Sau \u0111\u00f3 chuy\u1ec3n sang m\u00f4 h\u00ecnh logic. Ti\u1ebfp theo tr\u1edf th\u00e0nh m\u1ed9t l\u01b0\u1ee3c \u0111\u1ed3 v\u1eadt l\u00fd. ERD l\u00e0 c\u1ea7u n\u1ed1i gi\u1eefa logic kinh doanh v\u00e0 l\u01b0u tr\u1eef k\u1ef9 thu\u1eadt. N\u1ebfu s\u01a1 \u0111\u1ed3 kh\u00f4ng ph\u1ea3i l\u00e0 ngu\u1ed3n th\u00f4ng tin ch\u00ednh x\u00e1c, c\u01a1 s\u1edf d\u1eef li\u1ec7u ch\u1eafc ch\u1eafn s\u1ebd g\u1eb7p ph\u1ea3i s\u1ef1 m\u01a1 h\u1ed3.<\/p>\n

    M\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u hi\u1ec7u qu\u1ea3 \u0111\u00f2i h\u1ecfi s\u1ef1 ch\u00fa \u00fd c\u1ea9n th\u1eadn \u0111\u1ebfn t\u1eebng chi ti\u1ebft. \u0110\u00f3 kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 v\u1ebd c\u00e1c h\u00ecnh h\u1ed9p v\u00e0 \u0111\u01b0\u1eddng k\u1ebb. \u0110\u00f3 l\u00e0 vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u00e1c quy t\u1eafc tham gia cho d\u1eef li\u1ec7u. M\u1ed7i \u0111\u01b0\u1eddng k\u1ebb trong ERD \u0111\u1ea1i di\u1ec7n cho m\u1ed9t r\u00e0ng bu\u1ed9c. M\u1ed7i h\u00ecnh h\u1ed9p \u0111\u1ea1i di\u1ec7n cho m\u1ed9t \u0111\u01a1n v\u1ecb d\u1eef li\u1ec7u c\u1ea7n \u0111\u01b0\u1ee3c b\u1ea3o t\u1ed3n. B\u1ecf qua th\u1ef1c t\u1ebf n\u00e0y d\u1eabn \u0111\u1ebfn c\u00e1c h\u1ec7 th\u1ed1ng d\u1ec5 g\u00e3y v\u00e0 kh\u00f3 b\u1ea3o tr\u00ec.<\/p>\n

    2. Cardinality v\u00e0 M\u1ed1i Quan H\u1ec7: V\u01b0\u1ee3t Ngo\u00e0i C\u01a1 B\u1ea3n \ud83d\udd17<\/h2>\n

    Cardinality x\u00e1c \u0111\u1ecbnh m\u1ed1i quan h\u1ec7 s\u1ed1 l\u01b0\u1ee3ng gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3. N\u00f3 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi: M\u1ed9t th\u1ef1c th\u1ec3 c\u00f3 bao nhi\u00eau tr\u01b0\u1eddng h\u1ee3p li\u00ean quan \u0111\u1ebfn c\u00e1c tr\u01b0\u1eddng h\u1ee3p c\u1ee7a th\u1ef1c th\u1ec3 kh\u00e1c? T\u00e0i li\u1ec7u ti\u1ebfp th\u1ecb th\u01b0\u1eddng \u0111\u01a1n gi\u1ea3n h\u00f3a \u0111i\u1ec1u n\u00e0y th\u00e0nh m\u1ed9t-nhi\u1ec1u ho\u1eb7c nhi\u1ec1u-nhi\u1ec1u m\u00e0 kh\u00f4ng gi\u1ea3i th\u00edch h\u1ec7 qu\u1ea3.<\/p>\n

    Hi\u1ec3u r\u00f5 cardinality l\u00e0 \u0111i\u1ec1u then ch\u1ed1t cho hi\u1ec7u su\u1ea5t truy v\u1ea5n v\u00e0 t\u00ednh nh\u1ea5t qu\u00e1n d\u1eef li\u1ec7u. C\u00f3 ba lo\u1ea1i m\u1ed1i quan h\u1ec7 ch\u00ednh:<\/p>\n

      \n
    • M\u1ed9t-\u0111\u1ed1i-m\u1ed9t (1:1):<\/strong> M\u1ed7i b\u1ea3n ghi trong B\u1ea3ng A li\u00ean quan \u0111\u1ebfn \u0111\u00fang m\u1ed9t b\u1ea3n ghi trong B\u1ea3ng B. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 b\u1ea3o m\u1eadt ho\u1eb7c t\u00e1ch bi\u1ec7t d\u1eef li\u1ec7u.<\/li>\n
    • M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u (1:N):<\/strong> M\u1ed9t b\u1ea3n ghi trong B\u1ea3ng A li\u00ean quan \u0111\u1ebfn nhi\u1ec1u b\u1ea3n ghi trong B\u1ea3ng B. \u0110\u00e2y l\u00e0 m\u1ed1i quan h\u1ec7 ph\u1ed5 bi\u1ebfn nh\u1ea5t trong c\u00e1c h\u1ec7 th\u1ed1ng giao d\u1ecbch.<\/li>\n
    • Nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u (M:N):<\/strong> Nhi\u1ec1u b\u1ea3n ghi trong B\u1ea3ng A li\u00ean quan \u0111\u1ebfn nhi\u1ec1u b\u1ea3n ghi trong B\u1ea3ng B. \u0110i\u1ec1u n\u00e0y \u0111\u00f2i h\u1ecfi m\u1ed9t b\u1ea3ng giao \u0111i\u1ec3m \u0111\u1ec3 gi\u1ea3i quy\u1ebft v\u1ec1 m\u1eb7t v\u1eadt l\u00fd.<\/li>\n<\/ul>\n

      M\u1ed9t hi\u1ec3u l\u1ea7m ph\u1ed5 bi\u1ebfn l\u00e0 m\u1ed1i quan h\u1ec7 m\u1ed9t-\u0111\u1ed1i-m\u1ed9t lu\u00f4n v\u01b0\u1ee3t tr\u1ed9i trong vi\u1ec7c t\u00e1ch bi\u1ec7t d\u1eef li\u1ec7u. D\u00f9 ch\u00fang mang l\u1ea1i s\u1ef1 t\u00e1ch bi\u1ec7t, nh\u01b0ng ch\u00fang c\u00f3 th\u1ec3 t\u1ea1o ra \u0111\u1ed9 ph\u1ee9c t\u1ea1p kh\u00f4ng c\u1ea7n thi\u1ebft. Vi\u1ec7c chia d\u1eef li\u1ec7u th\u00e0nh hai b\u1ea3ng khi m\u1ed9t b\u1ea3ng duy nh\u1ea5t l\u00e0 \u0111\u1ee7 s\u1ebd l\u00e0m t\u0103ng chi ph\u00ed n\u1ed1i (join). \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t trong c\u00e1c thao t\u00e1c \u0111\u1ecdc.<\/p>\n

      Ng\u01b0\u1ee3c l\u1ea1i, b\u1ecf qua c\u00e1c m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn sao ch\u00e9p d\u1eef li\u1ec7u. N\u1ebfu b\u1ea1n c\u1ed1 g\u1eafng l\u01b0u m\u1ed9t danh s\u00e1ch gi\u00e1 tr\u1ecb v\u00e0o m\u1ed9t c\u1ed9t duy nh\u1ea5t m\u00e0 kh\u00f4ng c\u00f3 b\u1ea3ng giao \u0111i\u1ec3m ph\u00f9 h\u1ee3p, b\u1ea1n s\u1ebd vi ph\u1ea1m quy t\u1eafc chu\u1ea9n h\u00f3a. \u0110i\u1ec1u n\u00e0y khi\u1ebfn vi\u1ec7c c\u1eadp nh\u1eadt v\u00e0 truy v\u1ea5n d\u1eef li\u1ec7u tr\u1edf n\u00ean kh\u00f3 kh\u0103n h\u01a1n r\u1ea5t nhi\u1ec1u.<\/p>\n\n\n\n\n\n\n\n
      Lo\u1ea1i m\u1ed1i quan h\u1ec7<\/th>\nTri\u1ec3n khai v\u1eadt l\u00fd<\/th>\nSai l\u1ea7m ph\u1ed5 bi\u1ebfn<\/th>\n<\/tr>\n<\/thead>\n
      M\u1ed9t-\u0111\u1ed1i-m\u1ed9t<\/td>\nKh\u00f3a ngo\u1ea1i trong b\u1ea5t k\u1ef3 b\u1ea3ng n\u00e0o<\/td>\nChia t\u00e1ch d\u1eef li\u1ec7u qu\u00e1 m\u1ee9c<\/td>\n<\/tr>\n
      M\u1ed9t-\u0111a<\/td>\nKh\u00f3a ngo\u1ea1i trong b\u1ea3ng \u201c\u0110a\u201d<\/td>\nL\u1ed7i tham chi\u1ebfu v\u00f2ng<\/td>\n<\/tr>\n
      \u0110a-\u0111a<\/td>\nB\u1ea3ng li\u00ean k\u1ebft v\u1edbi hai kh\u00f3a ngo\u1ea1i<\/td>\nThi\u1ebfu r\u00e0ng bu\u1ed9c duy nh\u1ea5t tr\u00ean b\u1ea3ng li\u00ean k\u1ebft<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      Khi thi\u1ebft k\u1ebf c\u00e1c m\u1ed1i quan h\u1ec7 n\u00e0y, b\u1ea1n ph\u1ea3i xem x\u00e9t c\u00e1c quy t\u1eafc kinh doanh. Kh\u00e1ch h\u00e0ng c\u00f3 m\u1ed9t \u0111\u1ecba ch\u1ec9 hay nhi\u1ec1u \u0111\u1ecba ch\u1ec9? S\u1ea3n ph\u1ea9m thu\u1ed9c v\u1ec1 m\u1ed9t danh m\u1ee5c hay nhi\u1ec1u danh m\u1ee5c? S\u01a1 \u0111\u1ed3 ph\u1ea3i ph\u1ea3n \u00e1nh th\u1ef1c t\u1ebf ho\u1ea1t \u0111\u1ed9ng, ch\u1ee9 kh\u00f4ng ph\u1ea3i m\u1ed9t phi\u00ean b\u1ea3n l\u00fd t\u01b0\u1edfng h\u00f3a c\u1ee7a n\u00f3.<\/p>\n

      3. Chu\u1ea9n h\u00f3a: Huy\u1ec1n tho\u1ea1i v\u1ec1 d\u1ea1ng chu\u1ea9n 3NF \ud83d\udcca<\/h2>\n

      Chu\u1ea9n h\u00f3a l\u00e0 k\u1ef9 thu\u1eadt \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ed5 ch\u1ee9c d\u1eef li\u1ec7u nh\u1eb1m gi\u1ea3m thi\u1ec3u s\u1ef1 tr\u00f9ng l\u1eb7p. D\u1ea1ng chu\u1ea9n th\u1ee9 ba (3NF) th\u01b0\u1eddng \u0111\u01b0\u1ee3c nh\u1eafc \u0111\u1ebfn nh\u01b0 ti\u00eau chu\u1ea9n v\u00e0ng. Huy\u1ec1n tho\u1ea1i n\u00e0y cho r\u1eb1ng m\u1ecdi c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u1ec1u ph\u1ea3i \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a ho\u00e0n to\u00e0n \u0111\u1ebfn 3NF \u0111\u1ec3 \u0111\u01b0\u1ee3c coi l\u00e0 h\u1ee3p l\u1ec7. \u0110i\u1ec1u n\u00e0y kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng \u0111\u00fang.<\/p>\n

      Chu\u1ea9n h\u00f3a lo\u1ea1i b\u1ecf c\u00e1c b\u1ea5t th\u01b0\u1eddng. \u0110\u00e2y l\u00e0 nh\u1eefng v\u1ea5n \u0111\u1ec1 x\u1ea3y ra trong qu\u00e1 tr\u00ecnh ch\u00e8n, c\u1eadp nh\u1eadt ho\u1eb7c x\u00f3a d\u1eef li\u1ec7u. V\u00ed d\u1ee5, n\u1ebfu b\u1ea1n l\u01b0u t\u00ean kh\u00e1ch h\u00e0ng trong m\u1ed7i b\u1ea3n ghi \u0111\u01a1n h\u00e0ng, vi\u1ec7c thay \u0111\u1ed5i t\u00ean s\u1ebd y\u00eau c\u1ea7u c\u1eadp nh\u1eadt h\u00e0ng ng\u00e0n d\u00f2ng. \u0110\u00e2y l\u00e0 m\u1ed9t b\u1ea5t th\u01b0\u1eddng c\u1eadp nh\u1eadt. Chu\u1ea9n h\u00f3a kh\u1eafc ph\u1ee5c \u0111i\u1ec1u n\u00e0y b\u1eb1ng c\u00e1ch di chuy\u1ec3n t\u00ean v\u00e0o m\u1ed9t b\u1ea3ng kh\u00e1ch h\u00e0ng ri\u00eang bi\u1ec7t.<\/p>\n

      Tuy nhi\u00ean, tu\u00e2n th\u1ee7 nghi\u00eam ng\u1eb7t 3NF c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t. M\u1ed7i m\u1ed1i quan h\u1ec7 \u0111\u1ec1u y\u00eau c\u1ea7u th\u1ef1c hi\u1ec7n thao t\u00e1c join. C\u00e1c thao t\u00e1c join t\u1ed1n k\u00e9m v\u1ec1 m\u1eb7t t\u00ednh to\u00e1n. Trong c\u00e1c h\u1ec7 th\u1ed1ng b\u00e1o c\u00e1o c\u00f3 l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp cao, vi\u1ec7c chu\u1ea9n h\u00f3a qu\u00e1 m\u1ee9c c\u00f3 th\u1ec3 l\u00e0m ch\u1eadm t\u1ed1c \u0111\u1ed9 th\u1ef1c thi truy v\u1ea5n. \u0110\u00e2y ch\u00ednh l\u00e0 l\u00fac chu\u1ea9n h\u00f3a ng\u01b0\u1ee3c (denormalization) ph\u00e1t huy t\u00e1c d\u1ee5ng.<\/p>\n

      Chu\u1ea9n h\u00f3a ng\u01b0\u1ee3c l\u00e0 vi\u1ec7c ch\u1ee7 \u00fd \u0111\u01b0a v\u00e0o s\u1ef1 tr\u00f9ng l\u1eb7p nh\u1eb1m c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t \u0111\u1ecdc. \u0110\u00e2y l\u00e0 m\u1ed9t s\u1ef1 \u0111\u00e1nh \u0111\u1ed5i. B\u1ea1n ph\u1ea3i hy sinh t\u1ed1c \u0111\u1ed9 ghi v\u00e0 hi\u1ec7u qu\u1ea3 l\u01b0u tr\u1eef \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c t\u1ed1c \u0111\u1ed9 \u0111\u1ecdc nhanh h\u01a1n. Quy\u1ebft \u0111\u1ecbnh n\u00e0y kh\u00f4ng bao gi\u1edd \u0111\u01b0\u1ee3c \u0111\u01b0a ra m\u1ed9t c\u00e1ch nh\u1eb9 nh\u00e0ng. N\u00f3 \u0111\u00f2i h\u1ecfi s\u1ef1 hi\u1ec3u bi\u1ebft s\u00e2u s\u1eafc v\u1ec1 m\u1eabu truy c\u1eadp d\u1eef li\u1ec7u.<\/p>\n

      C\u00e1c y\u1ebfu t\u1ed1 then ch\u1ed1t c\u1ea7n xem x\u00e9t khi chu\u1ea9n h\u00f3a bao g\u1ed3m:<\/p>\n

        \n
      • C\u00e2n b\u1eb1ng gi\u1eefa \u0111\u1ecdc v\u00e0 ghi:<\/strong>H\u1ec7 th\u1ed1ng n\u00e0y ch\u1ee7 y\u1ebfu \u0111\u1ecdc hay ch\u1ee7 y\u1ebfu ghi?<\/li>\n
      • \u0110\u1ed9 ph\u1ee9c t\u1ea1p truy v\u1ea5n:<\/strong>B\u00e1o c\u00e1o c\u1ea7n thi\u1ebft c\u00f3 \u0111\u1ed9 ph\u1ee9c t\u1ea1p nh\u01b0 th\u1ebf n\u00e0o?<\/li>\n
      • Chi ph\u00ed l\u01b0u tr\u1eef:<\/strong>Li\u1ec7u s\u1ef1 tr\u00f9ng l\u1eb7p c\u00f3 th\u1ec3 ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c v\u1ec1 m\u1eb7t chi ph\u00ed kh\u00f4ng?<\/li>\n<\/ul>\n

        V\u00f4 t\u00ecnh tu\u00e2n theo 3NF m\u00e0 kh\u00f4ng ph\u00e2n t\u00edch t\u1ea3i c\u00f4ng vi\u1ec7c l\u00e0 con \u0111\u01b0\u1eddng d\u1eabn \u0111\u1ebfn m\u1ed9t \u1ee9ng d\u1ee5ng ho\u1ea1t \u0111\u1ed9ng ch\u1eadm ch\u1ea1p. M\u1ee5c ti\u00eau l\u00e0 c\u00e2n b\u1eb1ng gi\u1eefa t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u v\u00e0 y\u00eau c\u1ea7u hi\u1ec7u su\u1ea5t. \u0110\u00f4i khi, m\u1ed9t quan \u0111i\u1ec3m \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a ng\u01b0\u1ee3c c\u1ea9n th\u1eadn l\u1ea1i l\u00e0 gi\u1ea3i ph\u00e1p t\u1ed1t h\u01a1n so v\u1edbi m\u1ed9t l\u01b0\u1ee3c \u0111\u1ed3 \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a ho\u00e0n h\u1ea3o.<\/p>\n

        4. Ph\u1ee5 thu\u1ed9c c\u00f4ng c\u1ee5: T\u1ef1 \u0111\u1ed9ng h\u00f3a so v\u1edbi logic \ud83e\udd16<\/h2>\n

        C\u00e1c c\u00f4ng c\u1ee5 hi\u1ec7n \u0111\u1ea1i cung c\u1ea5p c\u00e1c t\u00ednh n\u0103ng nh\u01b0 sinh t\u1ef1 \u0111\u1ed9ng l\u01b0\u1ee3c \u0111\u1ed3 v\u00e0 k\u1ef9 thu\u1eadt ng\u01b0\u1ee3c. C\u00e1c nh\u00e0 cung c\u1ea5p qu\u1ea3ng b\u00e1 c\u00e1c kh\u1ea3 n\u0103ng n\u00e0y nh\u01b0 l\u00e0 c\u00e1ch ti\u1ebft ki\u1ec7m th\u1eddi gian. Huy\u1ec1n tho\u1ea1i \u1edf \u0111\u00e2y l\u00e0 c\u00f4ng c\u1ee5 c\u00f3 th\u1ec3 thay th\u1ebf nh\u00e0 thi\u1ebft k\u1ebf. M\u1ed9t c\u00f4ng c\u1ee5 v\u1ebd s\u01a1 \u0111\u1ed3 c\u00f3 th\u1ec3 v\u1ebd \u0111\u01b0\u1eddng n\u1ed1i, nh\u01b0ng n\u00f3 kh\u00f4ng th\u1ec3 hi\u1ec3u b\u1ed1i c\u1ea3nh kinh doanh.<\/p>\n

        Vi\u1ec7c sinh t\u1ef1 \u0111\u1ed9ng th\u01b0\u1eddng t\u1ea1o ra c\u00e1c l\u01b0\u1ee3c \u0111\u1ed3 \u0111\u00fang v\u1ec1 m\u1eb7t k\u1ef9 thu\u1eadt nh\u01b0ng sai v\u1ec1 m\u1eb7t logic. N\u00f3 c\u00f3 th\u1ec3 t\u1ea1o b\u1ea3ng d\u1ef1a tr\u00ean vi\u1ec7c ki\u1ec3m tra m\u00e3 ngu\u1ed3n thay v\u00ec y\u00eau c\u1ea7u kinh doanh. N\u00f3 c\u00f3 th\u1ec3 b\u1ecf s\u00f3t c\u00e1c m\u1ed1i quan h\u1ec7 \u1ea9n m\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a r\u00f5 r\u00e0ng.<\/p>\n

        S\u1ef1 gi\u00e1m s\u00e1t c\u1ee7a con ng\u01b0\u1eddi l\u00e0 thi\u1ebft y\u1ebfu. Ng\u01b0\u1eddi m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u ph\u1ea3i x\u00e1c minh \u0111\u1ea7u ra d\u1ef1a tr\u00ean nhu c\u1ea7u th\u1ef1c t\u1ebf c\u1ee7a t\u1ed5 ch\u1ee9c. C\u00e1c nhi\u1ec7m v\u1ee5 then ch\u1ed1t kh\u00f4ng th\u1ec3 t\u1ef1 \u0111\u1ed9ng h\u00f3a bao g\u1ed3m:<\/p>\n

          \n
        • X\u00e1c \u0111\u1ecbnh quy t\u1eafc kinh doanh:<\/strong>X\u00e1c \u0111\u1ecbnh thu\u1ed9c t\u00ednh n\u00e0o l\u00e0 b\u1eaft bu\u1ed9c.<\/li>\n
        • X\u1eed l\u00fd c\u00e1c tr\u01b0\u1eddng h\u1ee3p bi\u00ean:<\/strong>Quy\u1ebft \u0111\u1ecbnh c\u00e1ch x\u1eed l\u00fd c\u00e1c gi\u00e1 tr\u1ecb null ho\u1eb7c x\u00f3a m\u1ec1m.<\/li>\n
        • T\u1ed1i \u01b0u h\u00f3a cho s\u1ef1 ph\u00e1t tri\u1ec3n trong t\u01b0\u01a1ng lai:<\/strong> D\u1ef1 \u0111o\u00e1n c\u00e1ch d\u1eef li\u1ec7u s\u1ebd m\u1edf r\u1ed9ng.<\/li>\n<\/ul>\n

          C\u00e1c c\u00f4ng c\u1ee5 l\u00e0 tr\u1ee3 gi\u00fap, ch\u1ee9 kh\u00f4ng ph\u1ea3i ki\u1ebfn tr\u00fac s\u01b0. Ch\u00fang h\u1ed7 tr\u1ee3 vi\u1ec7c t\u1ea1o b\u1ea3n \u0111\u1ed3, nh\u01b0ng logic n\u1eb1m trong t\u00e2m tr\u00ed con ng\u01b0\u1eddi. D\u1ef1a ho\u00e0n to\u00e0n v\u00e0o t\u1ef1 \u0111\u1ed9ng h\u00f3a s\u1ebd d\u1eabn \u0111\u1ebfn c\u00e1c h\u1ec7 th\u1ed1ng c\u1ee9ng nh\u1eafc v\u00e0 kh\u00f3 th\u00edch \u1ee9ng. C\u00f4ng c\u1ee5 n\u00ean h\u1ed7 tr\u1ee3 quy tr\u00ecnh l\u00e0m vi\u1ec7c, ch\u1ee9 kh\u00f4ng n\u00ean chi ph\u1ed1i n\u00f3.<\/p>\n

          5. Kho\u1ea3ng c\u00e1ch gi\u1eefa thi\u1ebft k\u1ebf v\u00e0 tri\u1ec3n khai th\u1ef1c t\u1ebf \ud83d\udcdd<\/h2>\n

          C\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t r\u00f5 r\u1ec7t gi\u1eefa m\u00f4 h\u00ecnh logic v\u00e0 m\u00f4 h\u00ecnh v\u1eadt l\u00fd. M\u00f4 h\u00ecnh logic m\u00f4 t\u1ea3 c\u00e1c th\u1ef1c th\u1ec3 v\u00e0 m\u1ed1i quan h\u1ec7 m\u1ed9t c\u00e1ch kh\u00e1i ni\u1ec7m. M\u00f4 h\u00ecnh v\u1eadt l\u00fd x\u00e1c \u0111\u1ecbnh ki\u1ec3u d\u1eef li\u1ec7u, ch\u1ec9 m\u1ee5c v\u00e0 r\u00e0ng bu\u1ed9c.<\/p>\n

          Nhi\u1ec1u nh\u00f3m cho r\u1eb1ng m\u00f4 h\u00ecnh logic c\u00f3 th\u1ec3 chuy\u1ec3n \u0111\u1ed5i tr\u1ef1c ti\u1ebfp sang c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1eadt l\u00fd. \u0110i\u1ec1u n\u00e0y hi\u1ebfm khi x\u1ea3y ra. C\u00e1c h\u1ec7 th\u1ed1ng c\u01a1 s\u1edf d\u1eef li\u1ec7u kh\u00e1c nhau c\u00f3 nh\u1eefng kh\u1ea3 n\u0103ng kh\u00e1c nhau. M\u1ed9t m\u1ed1i quan h\u1ec7 ho\u1ea1t \u0111\u1ed9ng t\u1ed1t trong h\u1ec7 th\u1ed1ng n\u00e0y c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng k\u00e9m trong h\u1ec7 th\u1ed1ng kh\u00e1c.<\/p>\n

          V\u00ed d\u1ee5, ki\u1ec3u d\u1eef li\u1ec7u kh\u00e1c nhau. M\u1ed9t tr\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a l\u00e0 \u201cText\u201d trong m\u00f4 h\u00ecnh logic c\u00f3 th\u1ec3 c\u1ea7n ph\u1ea3i l\u00e0 \u201cVARCHAR(255)\u201d ho\u1eb7c \u201cTEXT\u201d trong c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1eadt l\u00fd. C\u00e1c chi\u1ebfn l\u01b0\u1ee3c ch\u1ec9 m\u1ee5c c\u0169ng kh\u00e1c nhau. M\u1ed9t ch\u1ec9 m\u1ee5c gi\u00fap t\u0103ng t\u1ed1c truy v\u1ea5n trong h\u1ec7 th\u1ed1ng n\u00e0y c\u00f3 th\u1ec3 l\u00e0m ch\u1eadm thao t\u00e1c ghi trong h\u1ec7 th\u1ed1ng kh\u00e1c.<\/p>\n

          Khi chuy\u1ec3n t\u1eeb thi\u1ebft k\u1ebf sang tri\u1ec3n khai, b\u1ea1n ph\u1ea3i \u0111i\u1ec1u ch\u1ec9nh ph\u00f9 h\u1ee3p v\u1edbi n\u1ec1n t\u1ea3ng c\u00f4ng ngh\u1ec7 c\u1ee5 th\u1ec3. H\u00e3y c\u00e2n nh\u1eafc nh\u1eefng \u0111i\u1ec1u ch\u1ec9nh sau:<\/p>\n

            \n
          • Ki\u1ec3u d\u1eef li\u1ec7u:<\/strong> \u0110\u1ea3m b\u1ea3o c\u00e1c ki\u1ec3u \u0111\u00e3 ch\u1ecdn ph\u00f9 h\u1ee3p v\u1edbi b\u1ed9 \u0111\u1ed9ng l\u01b0u tr\u1eef.<\/li>\n
          • Ch\u1ec9 m\u1ee5c:<\/strong> Th\u00eam ch\u1ec9 m\u1ee5c cho c\u00e1c c\u1ed9t th\u01b0\u1eddng xuy\u00ean \u0111\u01b0\u1ee3c truy v\u1ea5n.<\/li>\n
          • Chia t\u00e1ch:<\/strong> C\u00e2n nh\u1eafc chia nh\u1ecf c\u00e1c b\u1ea3ng l\u1edbn \u0111\u1ec3 qu\u1ea3n l\u00fd t\u1ed1t h\u01a1n.<\/li>\n
          • R\u00e0ng bu\u1ed9c:<\/strong> L\u1ef1a ch\u1ecdn gi\u1eefa ki\u1ec3m tra \u1edf c\u1ea5p \u0111\u1ed9 \u1ee9ng d\u1ee5ng v\u00e0 r\u00e0ng bu\u1ed9c \u1edf c\u1ea5p \u0111\u1ed9 c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/li>\n<\/ul>\n

            B\u1ecf qua nh\u1eefng kh\u00e1c bi\u1ec7t n\u00e0y d\u1eabn \u0111\u1ebfn kho\u1ea3ng c\u00e1ch gi\u1eefa thi\u1ebft k\u1ebf v\u00e0 th\u1ef1c t\u1ebf. H\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng, nh\u01b0ng s\u1ebd kh\u00f4ng \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u. C\u1ea7n xem x\u00e9t k\u1ef9 l\u01b0\u1ee1ng vi\u1ec7c tri\u1ec3n khai v\u1eadt l\u00fd \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o thi\u1ebft k\u1ebf ch\u1ecbu \u0111\u01b0\u1ee3c \u00e1p l\u1ef1c.<\/p>\n

            6. B\u1ea3o tr\u00ec v\u00e0 ph\u00e1t tri\u1ec3n \ud83d\udd04<\/h2>\n

            M\u1ed9t hi\u1ec3u l\u1ea7m quan tr\u1ecdng kh\u00e1c l\u00e0 thi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u l\u00e0 t\u0129nh. M\u1ed9t khi s\u01a1 \u0111\u1ed3 ERD \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t, n\u00f3 s\u1ebd kh\u00f4ng thay \u0111\u1ed5i. Tr\u00ean th\u1ef1c t\u1ebf, y\u00eau c\u1ea7u kinh doanh thay \u0111\u1ed5i. C\u00e1c t\u00ednh n\u0103ng m\u1edbi \u0111\u01b0\u1ee3c th\u00eam v\u00e0o. Quy \u0111\u1ecbnh thay \u0111\u1ed5i. M\u00f4 h\u00ecnh d\u1eef li\u1ec7u ph\u1ea3i ph\u00e1t tri\u1ec3n theo ch\u00fang.<\/p>\n

            T\u00e1i c\u1ea5u tr\u00fac c\u01a1 s\u1edf d\u1eef li\u1ec7u l\u00e0 \u0111i\u1ec1u kh\u00f3 kh\u0103n. Vi\u1ec7c thay \u0111\u1ed5i ki\u1ec3u c\u1ed9t ho\u1eb7c m\u1ed1i quan h\u1ec7 c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng c\u00e1c \u1ee9ng d\u1ee5ng hi\u1ec7n c\u00f3. Do \u0111\u00f3, thi\u1ebft k\u1ebf ph\u1ea3i linh ho\u1ea1t \u0111\u1ee7 \u0111\u1ec3 ch\u1ea5p nh\u1eadn thay \u0111\u1ed5i m\u00e0 kh\u00f4ng c\u1ea7n x\u00e2y d\u1ef1ng l\u1ea1i to\u00e0n b\u1ed9. C\u00e1c chi\u1ebfn l\u01b0\u1ee3c b\u1ea3o tr\u00ec bao g\u1ed3m:<\/p>\n

              \n
            • Qu\u1ea3n l\u00fd phi\u00ean b\u1ea3n:<\/strong> Theo d\u00f5i c\u00e1c thay \u0111\u1ed5i c\u1ea5u tr\u00fac theo th\u1eddi gian.<\/li>\n
            • C\u00e1c t\u1eadp l\u1ec7nh di chuy\u1ec3n:<\/strong> T\u1ef1 \u0111\u1ed9ng h\u00f3a vi\u1ec7c tri\u1ec3n khai c\u00e1c thay \u0111\u1ed5i.<\/li>\n
            • T\u00e0i li\u1ec7u:<\/strong> Duy tr\u00ec b\u1ea3n \u0111\u1ed3 \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt song song v\u1edbi m\u00e3 ngu\u1ed3n.<\/li>\n<\/ul>\n

              T\u00e0i li\u1ec7u th\u01b0\u1eddng b\u1ecb b\u1ecf qua cho \u0111\u1ebfn khi qu\u00e1 mu\u1ed9n. Khi m\u1ed9t nh\u00e0 ph\u00e1t tri\u1ec3n r\u1eddi d\u1ef1 \u00e1n, ki\u1ebfn th\u1ee9c v\u1ec1 c\u1ea5u tr\u00fac d\u1eef li\u1ec7u s\u1ebd b\u1ecb m\u1ea5t. M\u1ed9t s\u01a1 \u0111\u1ed3 ERD c\u1eadp nh\u1eadt s\u1ebd l\u00e0 t\u00e0i li\u1ec7u tham kh\u1ea3o ch\u00ednh cho th\u00e0nh vi\u00ean m\u1edbi. \u0110i\u1ec1u n\u00e0y gi\u00fap gi\u1ea3m \u0111\u01b0\u1eddng h\u1ecdc t\u1eadp v\u00e0 ng\u0103n ng\u1eeba l\u1ed7i.<\/p>\n

              S\u1ef1 ph\u00e1t tri\u1ec3n \u0111\u00f2i h\u1ecfi k\u1ef7 lu\u1eadt. M\u1ecdi thay \u0111\u1ed5i \u0111\u1ec1u ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 t\u00e1c \u0111\u1ed9ng \u0111\u1ebfn d\u1eef li\u1ec7u hi\u1ec7n c\u00f3. T\u00ednh t\u01b0\u01a1ng th\u00edch ng\u01b0\u1ee3c n\u00ean \u0111\u01b0\u1ee3c duy tr\u00ec m\u1ed7i khi c\u00f3 th\u1ec3. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o c\u00e1c \u1ee9ng d\u1ee5ng ph\u1ee5 thu\u1ed9c v\u00e0o c\u01a1 s\u1edf d\u1eef li\u1ec7u kh\u00f4ng b\u1ecb h\u1ecfng m\u1ed9t c\u00e1ch b\u1ea5t ng\u1edd.<\/p>\n

              7. T\u00f3m t\u1eaft c\u00e1c hi\u1ec3u l\u1ea7m ph\u1ed5 bi\u1ebfn so v\u1edbi th\u1ef1c t\u1ebf<\/h2>\n

              \u0110\u1ec3 t\u00f3m t\u1eaft c\u00e1c \u0111i\u1ec3m ch\u00ednh, ch\u00fang ta c\u00f3 th\u1ec3 ph\u00e2n lo\u1ea1i nh\u1eefng hi\u1ec3u l\u1ea7m ph\u1ed5 bi\u1ebfn nh\u1ea5t. B\u1ea3ng n\u00e0y cung c\u1ea5p tham chi\u1ebfu nhanh \u0111\u1ec3 ph\u00e2n bi\u1ec7t gi\u1eefa c\u00e1c tuy\u00ean b\u1ed1 ti\u1ebfp th\u1ecb v\u00e0 c\u00e1c s\u1ef1 th\u1eadt k\u1ef9 thu\u1eadt.<\/p>\n\n\n\n\n\n\n\n\n\n\n
              Hi\u1ec3u l\u1ea7m<\/th>\nTh\u1ef1c t\u1ebf<\/th>\n<\/tr>\n<\/thead>\n
              ERD ch\u1ec9 l\u00e0 nh\u1eefng b\u1ee9c tranh \u0111\u1eb9p m\u1eaft<\/td>\nERD l\u00e0 c\u00e1c h\u1ee3p \u0111\u1ed3ng k\u1ef9 thu\u1eadt x\u00e1c \u0111\u1ecbnh c\u00e1c quy t\u1eafc d\u1eef li\u1ec7u<\/td>\n<\/tr>\n
              Nhi\u1ec1u b\u1ea3ng h\u01a1n c\u00f3 ngh\u0129a l\u00e0 thi\u1ebft k\u1ebf t\u1ed1t h\u01a1n<\/td>\n\u0110\u1ed9 ph\u1ee9c t\u1ea1p l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t; s\u1ef1 c\u00e2n b\u1eb1ng l\u00e0 ch\u00eca kh\u00f3a<\/td>\n<\/tr>\n
              Chu\u1ea9n h\u00f3a lu\u00f4n l\u00e0 m\u1ee5c ti\u00eau<\/td>\nVi\u1ec7c kh\u00f4ng chu\u1ea9n h\u00f3a c\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9 \u0111\u1ecdc trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p c\u1ee5 th\u1ec3<\/td>\n<\/tr>\n
              C\u00e1c c\u00f4ng c\u1ee5 c\u00f3 th\u1ec3 t\u1ef1 \u0111\u1ed9ng h\u00f3a thi\u1ebft k\u1ebf<\/td>\nC\u00e1c c\u00f4ng c\u1ee5 h\u1ed7 tr\u1ee3, nh\u01b0ng logic \u0111\u00f2i h\u1ecfi s\u1ef1 gi\u00e1m s\u00e1t c\u1ee7a con ng\u01b0\u1eddi<\/td>\n<\/tr>\n
              M\u00f4 h\u00ecnh logic b\u1eb1ng v\u1edbi l\u01b0\u1ee3c \u0111\u1ed3 v\u1eadt l\u00fd<\/td>\nVi\u1ec7c tri\u1ec3n khai v\u1eadt l\u00fd \u0111\u00f2i h\u1ecfi c\u00e1c t\u1ed1i \u01b0u h\u00f3a c\u1ee5 th\u1ec3<\/td>\n<\/tr>\n
              Thi\u1ebft k\u1ebf l\u00e0 v\u0129nh vi\u1ec5n<\/td>\nL\u01b0\u1ee3c \u0111\u1ed3 ph\u1ea3i ph\u00e1t tri\u1ec3n theo nhu c\u1ea7u kinh doanh<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

              Suy ngh\u0129 cu\u1ed1i c\u00f9ng v\u1ec1 m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u \ud83e\udded<\/h2>\n

              X\u00e2y d\u1ef1ng m\u1ed9t h\u1ec7 th\u1ed1ng c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u00e1ng tin c\u1eady \u0111\u00f2i h\u1ecfi s\u1ef1 hi\u1ec3u r\u00f5 v\u1ec1 c\u00e1c nguy\u00ean t\u1eafc n\u1ec1n t\u1ea3ng. C\u00e1c s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 l\u00e0 c\u00f4ng c\u1ee5 m\u1ea1nh m\u1ebd khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u00fang c\u00e1ch. Ch\u00fang cung c\u1ea5p m\u1ed9t ng\u00f4n ng\u1eef chung gi\u1eefa c\u00e1c b\u00ean li\u00ean quan kinh doanh v\u00e0 c\u00e1c \u0111\u1ed9i k\u1ef9 thu\u1eadt.<\/p>\n

              Tuy nhi\u00ean, ch\u00fang kh\u00f4ng ph\u1ea3i l\u00e0 ph\u00e9p m\u00e0u. Ch\u00fang kh\u00f4ng t\u1ef1 gi\u1ea3i quy\u1ebft \u0111\u01b0\u1ee3c c\u00e1c v\u1ea5n \u0111\u1ec1 d\u1eef li\u1ec7u. Gi\u00e1 tr\u1ecb \u0111\u1ebfn t\u1eeb vi\u1ec7c \u00e1p d\u1ee5ng logic m\u1ed9t c\u00e1ch nghi\u00eam ng\u1eb7t trong giai \u0111o\u1ea1n thi\u1ebft k\u1ebf. Ch\u00fang ta ph\u1ea3i t\u1eeb ch\u1ed1i quan ni\u1ec7m r\u1eb1ng c\u00e1c c\u00f4ng c\u1ee5 ph\u1ea7n m\u1ec1m c\u00f3 th\u1ec3 thay th\u1ebf t\u01b0 duy ph\u1ea3n bi\u1ec7n. Ch\u00fang ta c\u0169ng ph\u1ea3i ch\u1ea5p nh\u1eadn r\u1eb1ng chu\u1ea9n h\u00f3a kh\u00f4ng ph\u1ea3i l\u00e0 gi\u1ea3i ph\u00e1p ph\u00f9 h\u1ee3p v\u1edbi m\u1ecdi t\u00ecnh hu\u1ed1ng.<\/p>\n

              Th\u00e0nh c\u00f4ng trong thi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u ph\u1ee5 thu\u1ed9c v\u00e0o s\u1ef1 r\u00f5 r\u00e0ng, ch\u00ednh x\u00e1c v\u00e0 kh\u1ea3 n\u0103ng th\u00edch \u1ee9ng. B\u1eb1ng c\u00e1ch t\u00e1ch bi\u1ec7t l\u1eddi qu\u1ea3ng c\u00e1o marketing kh\u1ecfi th\u1ef1c t\u1ebf k\u1ef9 thu\u1eadt, b\u1ea1n c\u00f3 th\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng b\u1ec1n v\u1eefng v\u00e0 m\u1edf r\u1ed9ng \u0111\u01b0\u1ee3c. T\u1eadp trung v\u00e0o t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u v\u00e0 c\u00e1c quy t\u1eafc kinh doanh. H\u00e3y \u0111\u1ec3 s\u01a1 \u0111\u1ed3 \u0111\u00f3ng vai tr\u00f2 l\u00e0 \u0111\u1ecbnh h\u01b0\u1edbng, ch\u1ee9 kh\u00f4ng ph\u1ea3i \u0111i\u1ec3m \u0111\u1ebfn.<\/p>\n

              Khi b\u1ea1n ti\u1ebfp c\u1eadn m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u v\u1edbi nh\u1eefng nguy\u00ean t\u1eafc n\u00e0y trong t\u00e2m tr\u00ed, k\u1ebft qu\u1ea3 s\u1ebd t\u1ef1 n\u00f3i l\u00ean \u0111i\u1ec1u \u0111\u00f3. H\u1ec7 th\u1ed1ng s\u1ebd d\u1ec5 b\u1ea3o tr\u00ec h\u01a1n. C\u00e1c truy v\u1ea5n s\u1ebd ch\u1ea1y nhanh h\u01a1n. D\u1eef li\u1ec7u s\u1ebd v\u1eabn ch\u00ednh x\u00e1c. \u0110\u00e2y ch\u00ednh l\u00e0 gi\u00e1 tr\u1ecb th\u1ef1c s\u1ef1 c\u1ee7a m\u1ed9t s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng t\u1ed1t.<\/p>\n","protected":false},"excerpt":{"rendered":"

              S\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 (ERD) n\u1eb1m \u1edf n\u1ec1n t\u1ea3ng c\u1ee7a ki\u1ebfn tr\u00fac d\u1eef li\u1ec7u v\u1eefng ch\u1eafc. Ch\u00fang cung c\u1ea5p b\u1ea3n v\u1ebd tr\u1ef1c quan v\u1ec1 c\u00e1ch th\u00f4ng tin \u0111\u01b0\u1ee3c…<\/p>\n","protected":false},"author":1,"featured_media":1695,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"Ph\u00e1 v\u1ee1 nh\u1eefng hi\u1ec3u l\u1ea7m v\u1ec1 ERD: Ti\u1ebfp th\u1ecb nh\u00e0 cung c\u1ea5p so v\u1edbi Th\u1ef1c t\u1ebf C\u01a1 s\u1edf d\u1eef li\u1ec7u \ud83d\udee0\ufe0f","_yoast_wpseo_metadesc":"T\u00e1ch bi\u1ec7t l\u1eddi qu\u1ea3ng c\u00e1o ti\u1ebfp th\u1ecb nh\u00e0 cung c\u1ea5p kh\u1ecfi th\u1ef1c t\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u. H\u1ecdc c\u00e1c s\u1ef1 th\u1eadt v\u1ec1 ERD, t\u00ednh cardinality v\u00e0 chu\u1ea9n h\u00f3a m\u00e0 kh\u00f4ng c\u1ea7n nh\u1eefng chi ti\u1ebft r\u01b0\u1eddm r\u00e0. \ud83d\uddc3\ufe0f","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[68],"tags":[89,92],"class_list":["post-1694","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-database-design","tag-academic","tag-erd"],"yoast_head":"\nPh\u00e1 v\u1ee1 nh\u1eefng hi\u1ec3u l\u1ea7m v\u1ec1 ERD: Ti\u1ebfp th\u1ecb nh\u00e0 cung c\u1ea5p so v\u1edbi Th\u1ef1c t\u1ebf C\u01a1 s\u1edf d\u1eef li\u1ec7u \ud83d\udee0\ufe0f<\/title>\n<meta name=\"description\" content=\"T\u00e1ch bi\u1ec7t l\u1eddi qu\u1ea3ng c\u00e1o ti\u1ebfp th\u1ecb nh\u00e0 cung c\u1ea5p kh\u1ecfi th\u1ef1c t\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u. H\u1ecdc c\u00e1c s\u1ef1 th\u1eadt v\u1ec1 ERD, t\u00ednh cardinality v\u00e0 chu\u1ea9n h\u00f3a m\u00e0 kh\u00f4ng c\u1ea7n nh\u1eefng chi ti\u1ebft r\u01b0\u1eddm r\u00e0. \ud83d\uddc3\ufe0f\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ph\u00e1 v\u1ee1 nh\u1eefng hi\u1ec3u l\u1ea7m v\u1ec1 ERD: Ti\u1ebfp th\u1ecb nh\u00e0 cung c\u1ea5p so v\u1edbi Th\u1ef1c t\u1ebf C\u01a1 s\u1edf d\u1eef li\u1ec7u \ud83d\udee0\ufe0f\" \/>\n<meta property=\"og:description\" content=\"T\u00e1ch bi\u1ec7t l\u1eddi qu\u1ea3ng c\u00e1o ti\u1ebfp th\u1ecb nh\u00e0 cung c\u1ea5p kh\u1ecfi th\u1ef1c t\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u. H\u1ecdc c\u00e1c s\u1ef1 th\u1eadt v\u1ec1 ERD, t\u00ednh cardinality v\u00e0 chu\u1ea9n h\u00f3a m\u00e0 kh\u00f4ng c\u1ea7n nh\u1eefng chi ti\u1ebft r\u01b0\u1eddm r\u00e0. \ud83d\uddc3\ufe0f\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/\" \/>\n<meta property=\"og:site_name\" content=\"Viz Note Vietnamese - AI Insights & Software Industry Updates\" \/>\n<meta property=\"article:published_time\" content=\"2026-04-11T23:24:11+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.viz-note.com\/vi\/wp-content\/uploads\/sites\/10\/2026\/04\/myth-busting-erd-infographic-hand-drawn-database-design.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1664\" \/>\n\t<meta property=\"og:image:height\" content=\"928\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"vpadmin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"vpadmin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"22 ph\u00fat\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/\"},\"author\":{\"name\":\"vpadmin\",\"@id\":\"https:\/\/www.viz-note.com\/vi\/#\/schema\/person\/d69595112293b803501f7b381be28255\"},\"headline\":\"B\u00f3c t\u00e1ch C\u00e1c Huy\u1ec1n Tho\u1ea1i V\u1ec1 S\u01a1 \u0110\u1ed3 Quan H\u1ec7 Th\u1ef1c Th\u1ec3: T\u00e1ch Bi\u1ec7t Ti\u1ebfp Th\u1ecb Nh\u00e0 Cung C\u1ea5p V\u1edbi Th\u1ef1c T\u1ebf C\u01a1 S\u1edf D\u1eef Li\u1ec7u\",\"datePublished\":\"2026-04-11T23:24:11+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/\"},\"wordCount\":4347,\"publisher\":{\"@id\":\"https:\/\/www.viz-note.com\/vi\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.viz-note.com\/vi\/wp-content\/uploads\/sites\/10\/2026\/04\/myth-busting-erd-infographic-hand-drawn-database-design.jpg\",\"keywords\":[\"academic\",\"erd\"],\"articleSection\":[\"Database Design\"],\"inLanguage\":\"vi\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/\",\"url\":\"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/\",\"name\":\"Ph\u00e1 v\u1ee1 nh\u1eefng hi\u1ec3u l\u1ea7m v\u1ec1 ERD: Ti\u1ebfp th\u1ecb nh\u00e0 cung c\u1ea5p so v\u1edbi Th\u1ef1c t\u1ebf C\u01a1 s\u1edf d\u1eef li\u1ec7u \ud83d\udee0\ufe0f\",\"isPartOf\":{\"@id\":\"https:\/\/www.viz-note.com\/vi\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.viz-note.com\/vi\/wp-content\/uploads\/sites\/10\/2026\/04\/myth-busting-erd-infographic-hand-drawn-database-design.jpg\",\"datePublished\":\"2026-04-11T23:24:11+00:00\",\"description\":\"T\u00e1ch bi\u1ec7t l\u1eddi qu\u1ea3ng c\u00e1o ti\u1ebfp th\u1ecb nh\u00e0 cung c\u1ea5p kh\u1ecfi th\u1ef1c t\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u. H\u1ecdc c\u00e1c s\u1ef1 th\u1eadt v\u1ec1 ERD, t\u00ednh cardinality v\u00e0 chu\u1ea9n h\u00f3a m\u00e0 kh\u00f4ng c\u1ea7n nh\u1eefng chi ti\u1ebft r\u01b0\u1eddm r\u00e0. \ud83d\uddc3\ufe0f\",\"breadcrumb\":{\"@id\":\"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/#breadcrumb\"},\"inLanguage\":\"vi\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"vi\",\"@id\":\"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/#primaryimage\",\"url\":\"https:\/\/www.viz-note.com\/vi\/wp-content\/uploads\/sites\/10\/2026\/04\/myth-busting-erd-infographic-hand-drawn-database-design.jpg\",\"contentUrl\":\"https:\/\/www.viz-note.com\/vi\/wp-content\/uploads\/sites\/10\/2026\/04\/myth-busting-erd-infographic-hand-drawn-database-design.jpg\",\"width\":1664,\"height\":928},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.viz-note.com\/vi\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"B\u00f3c t\u00e1ch C\u00e1c Huy\u1ec1n Tho\u1ea1i V\u1ec1 S\u01a1 \u0110\u1ed3 Quan H\u1ec7 Th\u1ef1c Th\u1ec3: T\u00e1ch Bi\u1ec7t Ti\u1ebfp Th\u1ecb Nh\u00e0 Cung C\u1ea5p V\u1edbi Th\u1ef1c T\u1ebf C\u01a1 S\u1edf D\u1eef Li\u1ec7u\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.viz-note.com\/vi\/#website\",\"url\":\"https:\/\/www.viz-note.com\/vi\/\",\"name\":\"Viz Note Vietnamese - AI Insights & Software Industry Updates\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\/\/www.viz-note.com\/vi\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.viz-note.com\/vi\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"vi\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.viz-note.com\/vi\/#organization\",\"name\":\"Viz Note Vietnamese - AI Insights & Software Industry Updates\",\"url\":\"https:\/\/www.viz-note.com\/vi\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"vi\",\"@id\":\"https:\/\/www.viz-note.com\/vi\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.viz-note.com\/vi\/wp-content\/uploads\/sites\/10\/2025\/03\/cropped-viz-note-logo.png\",\"contentUrl\":\"https:\/\/www.viz-note.com\/vi\/wp-content\/uploads\/sites\/10\/2025\/03\/cropped-viz-note-logo.png\",\"width\":512,\"height\":512,\"caption\":\"Viz Note Vietnamese - AI Insights & Software Industry Updates\"},\"image\":{\"@id\":\"https:\/\/www.viz-note.com\/vi\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.viz-note.com\/vi\/#\/schema\/person\/d69595112293b803501f7b381be28255\",\"name\":\"vpadmin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"vi\",\"@id\":\"https:\/\/www.viz-note.com\/vi\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/56e0eb902506d9cea7c7e209205383146b8e81c0ef2eff693d9d5e0276b3d7e3?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/56e0eb902506d9cea7c7e209205383146b8e81c0ef2eff693d9d5e0276b3d7e3?s=96&d=mm&r=g\",\"caption\":\"vpadmin\"},\"sameAs\":[\"https:\/\/www.viz-note.com\"],\"url\":\"https:\/\/www.viz-note.com\/vi\/author\/vpadmin\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Ph\u00e1 v\u1ee1 nh\u1eefng hi\u1ec3u l\u1ea7m v\u1ec1 ERD: Ti\u1ebfp th\u1ecb nh\u00e0 cung c\u1ea5p so v\u1edbi Th\u1ef1c t\u1ebf C\u01a1 s\u1edf d\u1eef li\u1ec7u \ud83d\udee0\ufe0f","description":"T\u00e1ch bi\u1ec7t l\u1eddi qu\u1ea3ng c\u00e1o ti\u1ebfp th\u1ecb nh\u00e0 cung c\u1ea5p kh\u1ecfi th\u1ef1c t\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u. H\u1ecdc c\u00e1c s\u1ef1 th\u1eadt v\u1ec1 ERD, t\u00ednh cardinality v\u00e0 chu\u1ea9n h\u00f3a m\u00e0 kh\u00f4ng c\u1ea7n nh\u1eefng chi ti\u1ebft r\u01b0\u1eddm r\u00e0. \ud83d\uddc3\ufe0f","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/","og_locale":"vi_VN","og_type":"article","og_title":"Ph\u00e1 v\u1ee1 nh\u1eefng hi\u1ec3u l\u1ea7m v\u1ec1 ERD: Ti\u1ebfp th\u1ecb nh\u00e0 cung c\u1ea5p so v\u1edbi Th\u1ef1c t\u1ebf C\u01a1 s\u1edf d\u1eef li\u1ec7u \ud83d\udee0\ufe0f","og_description":"T\u00e1ch bi\u1ec7t l\u1eddi qu\u1ea3ng c\u00e1o ti\u1ebfp th\u1ecb nh\u00e0 cung c\u1ea5p kh\u1ecfi th\u1ef1c t\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u. H\u1ecdc c\u00e1c s\u1ef1 th\u1eadt v\u1ec1 ERD, t\u00ednh cardinality v\u00e0 chu\u1ea9n h\u00f3a m\u00e0 kh\u00f4ng c\u1ea7n nh\u1eefng chi ti\u1ebft r\u01b0\u1eddm r\u00e0. \ud83d\uddc3\ufe0f","og_url":"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/","og_site_name":"Viz Note Vietnamese - AI Insights & Software Industry Updates","article_published_time":"2026-04-11T23:24:11+00:00","og_image":[{"width":1664,"height":928,"url":"https:\/\/www.viz-note.com\/vi\/wp-content\/uploads\/sites\/10\/2026\/04\/myth-busting-erd-infographic-hand-drawn-database-design.jpg","type":"image\/jpeg"}],"author":"vpadmin","twitter_card":"summary_large_image","twitter_misc":{"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi":"vpadmin","\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc":"22 ph\u00fat"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/#article","isPartOf":{"@id":"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/"},"author":{"name":"vpadmin","@id":"https:\/\/www.viz-note.com\/vi\/#\/schema\/person\/d69595112293b803501f7b381be28255"},"headline":"B\u00f3c t\u00e1ch C\u00e1c Huy\u1ec1n Tho\u1ea1i V\u1ec1 S\u01a1 \u0110\u1ed3 Quan H\u1ec7 Th\u1ef1c Th\u1ec3: T\u00e1ch Bi\u1ec7t Ti\u1ebfp Th\u1ecb Nh\u00e0 Cung C\u1ea5p V\u1edbi Th\u1ef1c T\u1ebf C\u01a1 S\u1edf D\u1eef Li\u1ec7u","datePublished":"2026-04-11T23:24:11+00:00","mainEntityOfPage":{"@id":"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/"},"wordCount":4347,"publisher":{"@id":"https:\/\/www.viz-note.com\/vi\/#organization"},"image":{"@id":"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/#primaryimage"},"thumbnailUrl":"https:\/\/www.viz-note.com\/vi\/wp-content\/uploads\/sites\/10\/2026\/04\/myth-busting-erd-infographic-hand-drawn-database-design.jpg","keywords":["academic","erd"],"articleSection":["Database Design"],"inLanguage":"vi"},{"@type":"WebPage","@id":"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/","url":"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/","name":"Ph\u00e1 v\u1ee1 nh\u1eefng hi\u1ec3u l\u1ea7m v\u1ec1 ERD: Ti\u1ebfp th\u1ecb nh\u00e0 cung c\u1ea5p so v\u1edbi Th\u1ef1c t\u1ebf C\u01a1 s\u1edf d\u1eef li\u1ec7u \ud83d\udee0\ufe0f","isPartOf":{"@id":"https:\/\/www.viz-note.com\/vi\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/#primaryimage"},"image":{"@id":"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/#primaryimage"},"thumbnailUrl":"https:\/\/www.viz-note.com\/vi\/wp-content\/uploads\/sites\/10\/2026\/04\/myth-busting-erd-infographic-hand-drawn-database-design.jpg","datePublished":"2026-04-11T23:24:11+00:00","description":"T\u00e1ch bi\u1ec7t l\u1eddi qu\u1ea3ng c\u00e1o ti\u1ebfp th\u1ecb nh\u00e0 cung c\u1ea5p kh\u1ecfi th\u1ef1c t\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u. H\u1ecdc c\u00e1c s\u1ef1 th\u1eadt v\u1ec1 ERD, t\u00ednh cardinality v\u00e0 chu\u1ea9n h\u00f3a m\u00e0 kh\u00f4ng c\u1ea7n nh\u1eefng chi ti\u1ebft r\u01b0\u1eddm r\u00e0. \ud83d\uddc3\ufe0f","breadcrumb":{"@id":"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/#breadcrumb"},"inLanguage":"vi","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/"]}]},{"@type":"ImageObject","inLanguage":"vi","@id":"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/#primaryimage","url":"https:\/\/www.viz-note.com\/vi\/wp-content\/uploads\/sites\/10\/2026\/04\/myth-busting-erd-infographic-hand-drawn-database-design.jpg","contentUrl":"https:\/\/www.viz-note.com\/vi\/wp-content\/uploads\/sites\/10\/2026\/04\/myth-busting-erd-infographic-hand-drawn-database-design.jpg","width":1664,"height":928},{"@type":"BreadcrumbList","@id":"https:\/\/www.viz-note.com\/vi\/myth-busting-entity-relationship-diagrams\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.viz-note.com\/vi\/"},{"@type":"ListItem","position":2,"name":"B\u00f3c t\u00e1ch C\u00e1c Huy\u1ec1n Tho\u1ea1i V\u1ec1 S\u01a1 \u0110\u1ed3 Quan H\u1ec7 Th\u1ef1c Th\u1ec3: T\u00e1ch Bi\u1ec7t Ti\u1ebfp Th\u1ecb Nh\u00e0 Cung C\u1ea5p V\u1edbi Th\u1ef1c T\u1ebf C\u01a1 S\u1edf D\u1eef Li\u1ec7u"}]},{"@type":"WebSite","@id":"https:\/\/www.viz-note.com\/vi\/#website","url":"https:\/\/www.viz-note.com\/vi\/","name":"Viz Note Vietnamese - AI Insights & Software Industry Updates","description":"","publisher":{"@id":"https:\/\/www.viz-note.com\/vi\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.viz-note.com\/vi\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"vi"},{"@type":"Organization","@id":"https:\/\/www.viz-note.com\/vi\/#organization","name":"Viz Note Vietnamese - AI Insights & Software Industry Updates","url":"https:\/\/www.viz-note.com\/vi\/","logo":{"@type":"ImageObject","inLanguage":"vi","@id":"https:\/\/www.viz-note.com\/vi\/#\/schema\/logo\/image\/","url":"https:\/\/www.viz-note.com\/vi\/wp-content\/uploads\/sites\/10\/2025\/03\/cropped-viz-note-logo.png","contentUrl":"https:\/\/www.viz-note.com\/vi\/wp-content\/uploads\/sites\/10\/2025\/03\/cropped-viz-note-logo.png","width":512,"height":512,"caption":"Viz Note Vietnamese - AI Insights & Software Industry Updates"},"image":{"@id":"https:\/\/www.viz-note.com\/vi\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/www.viz-note.com\/vi\/#\/schema\/person\/d69595112293b803501f7b381be28255","name":"vpadmin","image":{"@type":"ImageObject","inLanguage":"vi","@id":"https:\/\/www.viz-note.com\/vi\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/56e0eb902506d9cea7c7e209205383146b8e81c0ef2eff693d9d5e0276b3d7e3?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/56e0eb902506d9cea7c7e209205383146b8e81c0ef2eff693d9d5e0276b3d7e3?s=96&d=mm&r=g","caption":"vpadmin"},"sameAs":["https:\/\/www.viz-note.com"],"url":"https:\/\/www.viz-note.com\/vi\/author\/vpadmin\/"}]}},"_links":{"self":[{"href":"https:\/\/www.viz-note.com\/vi\/wp-json\/wp\/v2\/posts\/1694","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.viz-note.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.viz-note.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.viz-note.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.viz-note.com\/vi\/wp-json\/wp\/v2\/comments?post=1694"}],"version-history":[{"count":0,"href":"https:\/\/www.viz-note.com\/vi\/wp-json\/wp\/v2\/posts\/1694\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.viz-note.com\/vi\/wp-json\/wp\/v2\/media\/1695"}],"wp:attachment":[{"href":"https:\/\/www.viz-note.com\/vi\/wp-json\/wp\/v2\/media?parent=1694"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.viz-note.com\/vi\/wp-json\/wp\/v2\/categories?post=1694"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.viz-note.com\/vi\/wp-json\/wp\/v2\/tags?post=1694"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}