{"id":1633,"date":"2026-04-08T07:44:52","date_gmt":"2026-04-08T07:44:52","guid":{"rendered":"https:\/\/www.viz-note.com\/vi\/erd-standards-enterprise-backend-guide\/"},"modified":"2026-04-08T07:44:52","modified_gmt":"2026-04-08T07:44:52","slug":"erd-standards-enterprise-backend-guide","status":"publish","type":"post","link":"https:\/\/www.viz-note.com\/vi\/erd-standards-enterprise-backend-guide\/","title":{"rendered":"T\u1ed5ng quan to\u00e0n di\u1ec7n v\u1ec1 c\u00e1c ti\u00eau chu\u1ea9n s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 cho c\u00e1c backend c\u1ea5p doanh nghi\u1ec7p"},"content":{"rendered":"

Thi\u1ebft k\u1ebf ki\u1ebfn tr\u00fac d\u1eef li\u1ec7u cho m\u1ed9t h\u1ec7 th\u1ed1ng backend quy m\u00f4 l\u1edbn l\u00e0 m\u1ed9t nhi\u1ec7m v\u1ee5 n\u1ec1n t\u1ea3ng quy\u1ebft \u0111\u1ecbnh \u0111\u1ebfn \u0111\u1ed9 b\u1ec1n v\u00e0 s\u1ef1 \u1ed5n \u0111\u1ecbnh c\u1ee7a to\u00e0n b\u1ed9 \u1ee9ng d\u1ee5ng. S\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3, th\u01b0\u1eddng \u0111\u01b0\u1ee3c vi\u1ebft t\u1eaft l\u00e0 ERD, \u0111\u00f3ng vai tr\u00f2 l\u00e0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf cho ki\u1ebfn tr\u00fac n\u00e0y. N\u00f3 tr\u1ef1c quan h\u00f3a c\u1ea5u tr\u00fac d\u1eef li\u1ec7u, x\u00e1c \u0111\u1ecbnh c\u00e1ch c\u00e1c th\u00e0nh ph\u1ea7n th\u00f4ng tin kh\u00e1c nhau k\u1ebft n\u1ed1i, li\u00ean h\u1ec7 v\u00e0 t\u01b0\u01a1ng t\u00e1c trong h\u1ec7 th\u1ed1ng. Trong b\u1ed1i c\u1ea3nh doanh nghi\u1ec7p, n\u01a1i t\u00ednh nh\u1ea5t qu\u00e1n, to\u00e0n v\u1eb9n v\u00e0 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng c\u1ee7a d\u1eef li\u1ec7u l\u00e0 \u01b0u ti\u00ean h\u00e0ng \u0111\u1ea7u, tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n ERD \u0111\u00e3 \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t th\u1ef1c h\u00e0nh t\u1ed1t m\u00e0 c\u00f2n l\u00e0 \u0111i\u1ec1u t\u1ea5t y\u1ebfu.<\/p>\n

Kh\u00f4ng c\u00f3 m\u1ed9t c\u00e1ch ti\u1ebfp c\u1eadn chu\u1ea9n h\u00f3a trong m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u, c\u00e1c h\u1ec7 th\u1ed1ng backend c\u00f3 nguy c\u01a1 tr\u1edf n\u00ean mong manh. C\u00e1c quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean kh\u00f4ng nh\u1ea5t qu\u00e1n, c\u00e1c m\u1ed1i quan h\u1ec7 m\u01a1 h\u1ed3 v\u00e0 chu\u1ea9n h\u00f3a k\u00e9m c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn c\u00e1c \u0111i\u1ec3m ngh\u1ebdn hi\u1ec7u su\u1ea5t, chu k\u1ef3 b\u1ea3o tr\u00ec kh\u00f3 kh\u0103n v\u00e0 l\u1ed7i d\u1eef li\u1ec7u. H\u01b0\u1edbng d\u1eabn n\u00e0y kh\u00e1m ph\u00e1 c\u00e1c ti\u00eau chu\u1ea9n v\u00e0 ph\u01b0\u01a1ng ph\u00e1p quan tr\u1ecdng c\u1ea7n thi\u1ebft \u0111\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c l\u01b0\u1ee3c \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1eefng ch\u1eafc, ph\u00f9 h\u1ee3p v\u1edbi m\u00f4i tr\u01b0\u1eddng doanh nghi\u1ec7p ph\u1ee9c t\u1ea1p. Ch\u00fang ta s\u1ebd xem x\u00e9t c\u00e1c th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i, h\u1ec7 th\u1ed1ng k\u00fd hi\u1ec7u, quy t\u1eafc chu\u1ea9n h\u00f3a v\u00e0 chi\u1ebfn l\u01b0\u1ee3c qu\u1ea3n tr\u1ecb m\u00e0 c\u00e1c \u0111\u1ed9i ng\u0169 chuy\u00ean nghi\u1ec7p \u00e1p d\u1ee5ng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o l\u1edbp d\u1eef li\u1ec7u c\u1ee7a h\u1ecd lu\u00f4n \u0111\u00e1ng tin c\u1eady theo th\u1eddi gian.<\/p>\n

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

C\u00e1c th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i c\u1ee7a m\u1ed9t ERD doanh nghi\u1ec7p \ud83e\udde9<\/h2>\n

Tr\u01b0\u1edbc khi \u0111i s\u00e2u v\u00e0o c\u00e1c ti\u00eau chu\u1ea9n c\u1ee5 th\u1ec3, \u0111i\u1ec1u quan tr\u1ecdng l\u00e0 ph\u1ea3i hi\u1ec3u r\u00f5 c\u00e1c kh\u1ed1i x\u00e2y d\u1ef1ng c\u01a1 b\u1ea3n t\u1ea1o n\u00ean m\u1ed9t ERD. M\u1ed7i s\u01a1 \u0111\u1ed3 trong b\u1ed1i c\u1ea3nh chuy\u00ean nghi\u1ec7p \u0111\u1ec1u d\u1ef1a tr\u00ean ba th\u00e0nh ph\u1ea7n ch\u00ednh. Nh\u1eefng th\u00e0nh ph\u1ea7n n\u00e0y ph\u1ed1i h\u1ee3p v\u1edbi nhau \u0111\u1ec3 m\u00f4 t\u1ea3 c\u1ea5u tr\u00fac logic c\u1ee7a d\u1eef li\u1ec7u.<\/p>\n

    \n
  • Th\u1ef1c th\u1ec3:<\/strong> Ch\u00fang \u0111\u1ea1i di\u1ec7n cho c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ho\u1eb7c kh\u00e1i ni\u1ec7m trong th\u1ebf gi\u1edbi th\u1ef1c m\u00e0 d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef. Trong b\u1ed1i c\u1ea3nh backend, m\u1ed9t th\u1ef1c th\u1ec3 th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u00e1nh x\u1ea1 tr\u1ef1c ti\u1ebfp sang m\u1ed9t b\u1ea3ng c\u01a1 s\u1edf d\u1eef li\u1ec7u. C\u00e1c v\u00ed d\u1ee5 bao g\u1ed3mKh\u00e1ch h\u00e0ng<\/em>, \u0110\u01a1n h\u00e0ng<\/em>, ho\u1eb7cS\u1ea3n ph\u1ea9m<\/em>. C\u00e1c th\u1ef1c th\u1ec3 ph\u1ea3i \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh r\u00f5 r\u00e0ng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o m\u1ed7i b\u1ea3n ghi \u0111\u1ec1u c\u00f3 m\u1ed9t \u0111\u1ecbnh danh duy nh\u1ea5t.<\/li>\n
  • Thu\u1ed9c t\u00ednh:<\/strong> C\u00e1c thu\u1ed9c t\u00ednh m\u00f4 t\u1ea3 c\u00e1c \u0111\u1eb7c t\u00ednh c\u1ee5 th\u1ec3 ho\u1eb7c \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3. Ch\u00fang t\u01b0\u01a1ng \u1ee9ng v\u1edbi c\u00e1c c\u1ed9t trong m\u1ed9t b\u1ea3ng. \u0110\u1ed1i v\u1edbi m\u1ed9t th\u1ef1c th\u1ec3Kh\u00e1ch h\u00e0ng<\/em> th\u00ec c\u00e1c thu\u1ed9c t\u00ednh c\u00f3 th\u1ec3 bao g\u1ed3mM\u00e3Kh\u00e1chH\u00e0ng<\/em>, H\u1ecdT\u00ean\u0110\u1ea7y\u0110\u1ee7<\/em>, v\u00e0\u0110\u1ecbaCh\u1ec9Email<\/em>. Vi\u1ec7c x\u00e1c \u0111\u1ecbnh \u0111\u00fang ki\u1ec3u d\u1eef li\u1ec7u cho c\u00e1c thu\u1ed9c t\u00ednh l\u00e0 \u0111i\u1ec1u ki\u1ec7n then ch\u1ed1t \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o to\u00e0n v\u1eb9n d\u1eef li\u1ec7u.<\/li>\n
  • M\u1ed1i quan h\u1ec7:<\/strong> C\u00e1c m\u1ed1i quan h\u1ec7 x\u00e1c \u0111\u1ecbnh c\u00e1ch c\u00e1c th\u1ef1c th\u1ec3 t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau. Ch\u00fang thi\u1ebft l\u1eadp c\u00e1c r\u00e0ng bu\u1ed9c v\u00e0 li\u00ean k\u1ebft gi\u1eefa c\u00e1c b\u1ea3ng. V\u00ed d\u1ee5, m\u1ed9tKh\u00e1ch h\u00e0ng<\/em> c\u00f3 th\u1ec3 \u0111\u1eb7t nhi\u1ec1u\u0110\u01a1n h\u00e0ng<\/em>. M\u1ed1i quan h\u1ec7 n\u00e0y x\u00e1c \u0111\u1ecbnh c\u00e1c r\u00e0ng bu\u1ed9c kh\u00f3a ngo\u1ea1i v\u00e0 logic n\u1ed1i k\u1ebft c\u1ea7n thi\u1ebft trong backend.<\/li>\n<\/ul>\n

    Trong ph\u00e1t tri\u1ec3n c\u1ea5p doanh nghi\u1ec7p, c\u00e1c th\u00e0nh ph\u1ea7n n\u00e0y kh\u00f4ng ch\u1ec9 l\u00e0 nh\u1eefng kh\u00e1i ni\u1ec7m tr\u1eebu t\u01b0\u1ee3ng; ch\u00fang l\u00e0 n\u1ec1n t\u1ea3ng cho t\u1ed1i \u01b0u h\u00f3a truy v\u1ea5n, ki\u1ec3m so\u00e1t truy c\u1eadp v\u00e0 c\u00e1c chi\u1ebfn l\u01b0\u1ee3c di chuy\u1ec3n d\u1eef li\u1ec7u. M\u1ed9t s\u01a1 \u0111\u1ed3 ERD \u0111\u01b0\u1ee3c t\u00e0i li\u1ec7u h\u00f3a t\u1ed1t gi\u00fap c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n hi\u1ec3u \u0111\u01b0\u1ee3c lu\u1ed3ng d\u1eef li\u1ec7u m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea3i ki\u1ec3m tra t\u1eebng d\u00f2ng m\u00e3.<\/p>\n

    Ti\u00eau chu\u1ea9n k\u00fd hi\u1ec7u v\u00e0 quy \u01b0\u1edbc tr\u1ef1c quan \ud83d\udcd0<\/h2>\n

    Kh\u00f4ng c\u00f3 m\u1ed9t c\u00fa ph\u00e1p duy nh\u1ea5t cho vi\u1ec7c v\u1ebd s\u01a1 \u0111\u1ed3 ERD, nh\u01b0ng c\u00f3 nh\u1eefng ti\u00eau chu\u1ea9n \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn r\u1ed9ng r\u00e3i nh\u1eb1m \u0111\u1ea3m b\u1ea3o t\u00ednh r\u00f5 r\u00e0ng v\u00e0 nh\u1ea5t qu\u00e1n gi\u1eefa c\u00e1c nh\u00f3m kh\u00e1c nhau. Vi\u1ec7c ch\u1ecdn m\u1ed9t k\u00fd hi\u1ec7u v\u00e0 tu\u00e2n th\u1ee7 n\u00f3 l\u00e0 m\u1ed9t quy\u1ebft \u0111\u1ecbnh qu\u1ea3n tr\u1ecb quan tr\u1ecdng.<\/p>\n

    K\u00fd hi\u1ec7u Chen so v\u1edbi k\u00fd hi\u1ec7u Ch\u00e2n chim<\/h3>\n

    Truy\u1ec1n th\u1ed1ng, k\u00fd hi\u1ec7u Chen l\u00e0 chu\u1ea9n m\u1ef1c, s\u1eed d\u1ee5ng h\u00ecnh ch\u1eef nh\u1eadt cho c\u00e1c th\u1ef1c th\u1ec3 v\u00e0 h\u00ecnh thoi cho c\u00e1c m\u1ed1i quan h\u1ec7. M\u1eb7c d\u00f9 r\u00f5 r\u00e0ng, nh\u01b0ng n\u00f3 \u00edt ph\u1ed5 bi\u1ebfn h\u01a1n trong c\u00e1c c\u00f4ng c\u1ee5 ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m hi\u1ec7n \u0111\u1ea1i. K\u00fd hi\u1ec7u Ch\u00e2n chim \u0111\u00e3 tr\u1edf th\u00e0nh l\u1ef1a ch\u1ecdn \u01b0u ti\u00ean trong ng\u00e0nh v\u00ec m\u1ed9t s\u1ed1 l\u00fd do:<\/p>\n

      \n
    • R\u00f5 r\u00e0ng v\u1ec1 t\u00ednh b\u1ed9i s\u1ed1:<\/strong> N\u00f3 s\u1eed d\u1ee5ng c\u00e1c k\u00fd hi\u1ec7u c\u1ee5 th\u1ec3 (\u0111\u01b0\u1eddng th\u1eb3ng, h\u00ecnh tr\u00f2n v\u00e0 “ch\u00e2n”) \u0111\u1ec3 bi\u1ec3u th\u1ecb tr\u1ef1c quan c\u00e1c m\u1ed1i quan h\u1ec7 m\u1ed9t-\u0111\u1ed1i-m\u1ed9t, m\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u v\u00e0 nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u.<\/li>\n
    • H\u1ed7 tr\u1ee3 c\u00f4ng c\u1ee5:<\/strong> H\u1ea7u h\u1ebft c\u00e1c c\u00f4ng c\u1ee5 thi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u hi\u1ec7n \u0111\u1ea1i v\u00e0 c\u00e1c c\u00f4ng c\u1ee5 ph\u1ee5c h\u1ed3i thi\u1ebft k\u1ebf \u0111\u1ec1u h\u1ed7 tr\u1ee3 s\u1eb5n c\u00e1c k\u00fd hi\u1ec7u Ch\u00e2n chim ho\u1eb7c c\u00e1c k\u00fd hi\u1ec7u \u0111\u01b0\u1ee3c suy ra t\u1eeb UML.<\/li>\n
    • Kh\u1ea3 n\u0103ng \u0111\u1ecdc hi\u1ec3u:<\/strong> N\u00f3i chung, n\u00f3 ng\u1eafn g\u1ecdn h\u01a1n v\u00e0 d\u1ec5 \u0111\u1ecdc h\u01a1n khi x\u1eed l\u00fd c\u00e1c l\u01b0\u1ee3c \u0111\u1ed3 ph\u1ee9c t\u1ea1p, c\u00f3 li\u00ean k\u1ebft ch\u1eb7t ch\u1ebd.<\/li>\n<\/ul>\n

      So s\u00e1nh c\u00e1c h\u1ec7 th\u1ed1ng k\u00fd hi\u1ec7u<\/h3>\n\n\n\n\n\n\n\n\n
      Phong c\u00e1ch k\u00fd hi\u1ec7u<\/th>\nBi\u1ec3u di\u1ec5n th\u1ef1c th\u1ec3<\/th>\nBi\u1ec3u di\u1ec5n m\u1ed1i quan h\u1ec7<\/th>\nTr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng t\u1ed1t nh\u1ea5t<\/th>\n<\/tr>\n<\/thead>\n
      Ch\u00e2n chim<\/td>\nH\u00ecnh ch\u1eef nh\u1eadt<\/td>\n\u0110\u01b0\u1eddng th\u1eb3ng v\u1edbi c\u00e1c k\u00fd hi\u1ec7u (ch\u00e2n chim, h\u00ecnh tr\u00f2n, \u0111\u01b0\u1eddng th\u1eb3ng)<\/td>\nThi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u quan h\u1ec7<\/td>\n<\/tr>\n
      S\u01a1 \u0111\u1ed3 l\u1edbp UML<\/td>\nH\u1ed9p l\u1edbp v\u1edbi c\u00e1c ng\u0103n<\/td>\nM\u0169i t\u00ean v\u1edbi c\u00e1c b\u1ed9i s\u1ed1 (0..1, 1..*)<\/td>\nM\u00f4 h\u00ecnh h\u00f3a h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng<\/td>\n<\/tr>\n
      Chen<\/td>\nH\u00ecnh ch\u1eef nh\u1eadt<\/td>\nH\u00ecnh thoi k\u1ebft n\u1ed1i c\u00e1c th\u1ef1c th\u1ec3<\/td>\nM\u00f4 h\u00ecnh h\u1ecdc thu\u1eadt\/ly thuy\u1ebft<\/td>\n<\/tr>\n
      IE (K\u1ef9 thu\u1eadt th\u00f4ng tin)<\/td>\nH\u00ecnh ch\u1eef nh\u1eadt v\u1edbi thu\u1ed9c t\u00ednh<\/td>\n\u0110\u01b0\u1eddng th\u1eb3ng v\u1edbi c\u00e1c ch\u1ec9 b\u00e1o kh\u00f3a ch\u00ednh<\/td>\nT\u00e0i li\u1ec7u H\u1ec7 th\u1ed1ng C\u1ed5 \u0111i\u1ec3n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      \u0110\u1ed1i v\u1edbi c\u00e1c backend doanh nghi\u1ec7p, k\u00fd hi\u1ec7u Crow\u2019s Foot th\u01b0\u1eddng \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb do n\u00f3 \u00e1nh x\u1ea1 tr\u1ef1c ti\u1ebfp \u0111\u1ebfn c\u00e1c r\u00e0ng bu\u1ed9c quan h\u1ec7. \u0110i\u1ec1u n\u00e0y l\u00e0m gi\u1ea3m thi\u1ec3u s\u1ef1 m\u01a1 h\u1ed3 khi c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n di\u1ec5n gi\u1ea3i s\u01a1 \u0111\u1ed3 trong qu\u00e1 tr\u00ecnh tri\u1ec3n khai.<\/p>\n

      Chu\u1ea9n h\u00f3a: \u0110\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u \ud83d\udd04<\/h2>\n

      Chu\u1ea9n h\u00f3a l\u00e0 qu\u00e1 tr\u00ecnh t\u1ed5 ch\u1ee9c d\u1eef li\u1ec7u trong c\u01a1 s\u1edf d\u1eef li\u1ec7u nh\u1eb1m gi\u1ea3m thi\u1ec3u s\u1ef1 tr\u00f9ng l\u1eb7p v\u00e0 c\u1ea3i thi\u1ec7n t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u. M\u1eb7c d\u00f9 c\u00e1c h\u1ec7 th\u1ed1ng hi\u1ec7n \u0111\u1ea1i \u0111\u00f4i khi kh\u00f4ng chu\u1ea9n h\u00f3a \u0111\u1ec3 t\u1ed1i \u01b0u hi\u1ec7u su\u1ea5t, nh\u01b0ng vi\u1ec7c hi\u1ec3u r\u00f5 c\u00e1c quy t\u1eafc chu\u1ea9n h\u00f3a l\u00e0 thi\u1ebft y\u1ebfu \u0111\u1ec3 thi\u1ebft k\u1ebf m\u1ed9t l\u01b0\u1ee3c \u0111\u1ed3 ban \u0111\u1ea7u v\u1eefng ch\u1eafc.<\/p>\n

      C\u00e1c d\u1ea1ng chu\u1ea9n h\u00f3a<\/h3>\n
        \n
      • D\u1ea1ng chu\u1ea9n h\u00f3a th\u1ee9 nh\u1ea5t (1NF):<\/strong>M\u1ecdi c\u1ed9t ph\u1ea3i ch\u1ee9a c\u00e1c gi\u00e1 tr\u1ecb nguy\u00ean t\u1eed. Vi\u1ec7c li\u1ec7t k\u00ea c\u00e1c gi\u00e1 tr\u1ecb trong m\u1ed9t \u00f4 duy nh\u1ea5t l\u00e0 b\u1ecb c\u1ea5m. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u1ed7i giao \u0111i\u1ec3m gi\u1eefa h\u00e0ng v\u00e0 c\u1ed9t ch\u1ee9a m\u1ed9t ph\u1ea7n d\u1eef li\u1ec7u duy nh\u1ea5t v\u00e0 kh\u00f4ng th\u1ec3 chia nh\u1ecf.<\/li>\n
      • D\u1ea1ng chu\u1ea9n h\u00f3a th\u1ee9 hai (2NF):<\/strong>B\u1ea3ng ph\u1ea3i \u1edf d\u1ea1ng 1NF, v\u00e0 m\u1ecdi thu\u1ed9c t\u00ednh kh\u00f4ng kh\u00f3a ph\u1ea3i ph\u1ee5 thu\u1ed9c ho\u00e0n to\u00e0n v\u00e0o kh\u00f3a ch\u00ednh. \u0110i\u1ec1u n\u00e0y ng\u0103n ch\u1eb7n c\u00e1c ph\u1ee5 thu\u1ed9c ri\u00eang ph\u1ea7n, n\u01a1i m\u1ed9t c\u1ed9t ph\u1ee5 thu\u1ed9c ch\u1ec9 v\u00e0o m\u1ed9t ph\u1ea7n c\u1ee7a kh\u00f3a h\u1ee3p th\u00e0nh.<\/li>\n
      • D\u1ea1ng chu\u1ea9n h\u00f3a th\u1ee9 ba (3NF):<\/strong>B\u1ea3ng ph\u1ea3i \u1edf d\u1ea1ng 2NF, v\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c c\u00f3 c\u00e1c ph\u1ee5 thu\u1ed9c b\u1eafc c\u1ea7u. C\u00e1c thu\u1ed9c t\u00ednh kh\u00f4ng kh\u00f3a kh\u00f4ng \u0111\u01b0\u1ee3c ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c thu\u1ed9c t\u00ednh kh\u00f4ng kh\u00f3a kh\u00e1c. V\u00ed d\u1ee5, n\u1ebfu Th\u00e0nh ph\u1ed1<\/em> ph\u1ee5 thu\u1ed9c v\u00e0o M\u00e3 b\u01b0u ch\u00ednh<\/em>, v\u00e0 M\u00e3 b\u01b0u ch\u00ednh<\/em> ph\u1ee5 thu\u1ed9c v\u00e0o ID<\/em>, Th\u00e0nh ph\u1ed1<\/em> th\u00ec Th\u00e0nh ph\u1ed1 n\u00ean \u0111\u01b0\u1ee3c di chuy\u1ec3n sang m\u1ed9t b\u1ea3ng ri\u00eang bi\u1ec7t.<\/li>\n
      • D\u1ea1ng chu\u1ea9n h\u00f3a Boyce-Codd (BCNF):<\/strong>M\u1ed9t phi\u00ean b\u1ea3n nghi\u00eam ng\u1eb7t h\u01a1n c\u1ee7a 3NF. N\u00f3 y\u00eau c\u1ea7u r\u1eb1ng v\u1edbi m\u1ecdi ph\u1ee5 thu\u1ed9c h\u00e0m X \u2192 Y, X ph\u1ea3i l\u00e0 si\u00eau kh\u00f3a. \u0110i\u1ec1u n\u00e0y x\u1eed l\u00fd m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p \u0111\u1eb7c bi\u1ec7t trong 3NF n\u01a1i m\u1ed9t \u0111\u1ecbnh th\u1ee9c l\u00e0 kh\u00f3a kh\u1ea3 d\u1ee5ng nh\u01b0ng kh\u00f4ng ph\u1ea3i l\u00e0 kh\u00f3a ch\u00ednh.<\/li>\n<\/ul>\n

        S\u1ef1 \u0111\u00e1nh \u0111\u1ed5i trong chu\u1ea9n h\u00f3a<\/h3>\n\n\n\n\n\n\n
        M\u1ee9c \u0111\u1ed9<\/th>\nL\u1ee3i \u00edch<\/th>\nChi ph\u00ed<\/th>\n<\/tr>\n<\/thead>\n
        Chu\u1ea9n h\u00f3a cao (3NF\/BCNF)<\/td>\nT\u1ed1i thi\u1ec3u s\u1ef1 tr\u00f9ng l\u1eb7p, \u0111\u1ed9 to\u00e0n v\u1eb9n cao<\/td>\nC\u1ea7n nhi\u1ec1u thao t\u00e1c n\u1ed1i h\u01a1n cho c\u00e1c truy v\u1ea5n<\/td>\n<\/tr>\n
        Chu\u1ea9n h\u00f3a th\u1ea5p (kh\u00f4ng chu\u1ea9n h\u00f3a)<\/td>\nHi\u1ec7u su\u1ea5t \u0111\u1ecdc nhanh h\u01a1n<\/td>\nR\u1ee7i ro cao h\u01a1n v\u1ec1 s\u1ef1 kh\u00f4ng nh\u1ea5t qu\u00e1n d\u1eef li\u1ec7u<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        C\u00e1c h\u1ec7 th\u1ed1ng doanh nghi\u1ec7p th\u01b0\u1eddng h\u01b0\u1edbng \u0111\u1ebfn 3NF trong c\u00e1c l\u01b0\u1ee3c \u0111\u1ed3 giao d\u1ecbch c\u1ee7a h\u1ecd. Khi hi\u1ec7u su\u1ea5t \u0111\u1ecdc tr\u1edf th\u00e0nh \u0111i\u1ec3m ngh\u1ebdn, vi\u1ec7c kh\u00f4ng chu\u1ea9n h\u00f3a s\u1ebd \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng m\u1ed9t c\u00e1ch ch\u1ecdn l\u1ecdc cho c\u00e1c view c\u1ee5 th\u1ec3 ho\u1eb7c c\u00e1c b\u1ea3ng b\u00e1o c\u00e1o, thay v\u00ec l\u01b0\u1ee3c \u0111\u1ed3 giao d\u1ecbch c\u1ed1t l\u00f5i.<\/p>\n

        Quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean v\u00e0 v\u1ec7 sinh l\u01b0\u1ee3c \u0111\u1ed3 \ud83c\udff7\ufe0f<\/h2>\n

        M\u1ed9t quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean nh\u1ea5t qu\u00e1n l\u00e0 r\u1ea5t quan tr\u1ecdng cho kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec. Khi nhi\u1ec1u \u0111\u1ed9i ng\u0169 l\u00e0m vi\u1ec7c tr\u00ean c\u00f9ng m\u1ed9t backend, s\u1ef1 m\u01a1 h\u1ed3 trong \u0111\u1eb7t t\u00ean d\u1eabn \u0111\u1ebfn l\u1ed7i. M\u1ed9t ti\u00eau chu\u1ea9n c\u1ea7n \u0111\u01b0\u1ee3c ghi ch\u00e9p v\u00e0 th\u1ef1c thi th\u00f4ng qua c\u00e1c c\u00f4ng c\u1ee5 ki\u1ec3m tra t\u0129nh ho\u1eb7c c\u00e1c script x\u00e1c th\u1ef1c l\u01b0\u1ee3c \u0111\u1ed3.<\/p>\n

        Quy t\u1eafc \u0111\u1eb7t t\u00ean b\u1ea3ng<\/h3>\n
          \n
        • S\u1ed1 nhi\u1ec1u so v\u1edbi s\u1ed1 \u00edt:<\/strong> C\u00f3 tranh c\u00e3i, nh\u01b0ng s\u1ef1 nh\u1ea5t qu\u00e1n m\u1edbi l\u00e0 ch\u00eca kh\u00f3a. C\u00e1c t\u00ean s\u1ed1 nhi\u1ec1u (v\u00ed d\u1ee5 nh\u01b0 Ng\u01b0\u1eddi d\u00f9ng<\/em>, \u0110\u01a1n h\u00e0ng<\/em>) th\u01b0\u1eddng nghe t\u1ef1 nhi\u00ean h\u01a1n trong c\u00e1c c\u00e2u ti\u1ebfng Anh. C\u00e1c t\u00ean s\u1ed1 \u00edt (v\u00ed d\u1ee5 nh\u01b0 Ng\u01b0\u1eddi d\u00f9ng<\/em>, \u0110\u01a1n h\u00e0ng<\/em>) th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u01b0a chu\u1ed9ng h\u01a1n trong ng\u1eef c\u1ea3nh h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. Ch\u1ecdn m\u1ed9t c\u00e1ch v\u00e0 \u00e1p d\u1ee5ng n\u00f3 tr\u00ean to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng.<\/li>\n
        • D\u1ea5u g\u1ea1ch d\u01b0\u1edbi so v\u1edbi CamelCase:<\/strong> D\u1ea5u g\u1ea1ch d\u01b0\u1edbi (snake_case<\/em>) l\u00e0 chu\u1ea9n cho c\u00e1c \u0111\u1ecbnh danh SQL. CamelCase (camelCase<\/em>) ph\u1ed5 bi\u1ebfn trong m\u00e3 ngu\u1ed3n \u1ee9ng d\u1ee5ng. \u0110\u1ea3m b\u1ea3o l\u1edbp c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 l\u1edbp \u1ee9ng d\u1ee5ng th\u1ed1ng nh\u1ea5t v\u1ec1 chi\u1ebfn l\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i.<\/li>\n
        • Tr\u00e1nh s\u1eed d\u1ee5ng t\u1eeb kh\u00f3a \u0111\u01b0\u1ee3c b\u1ea3o l\u01b0u:<\/strong> Kh\u00f4ng bao gi\u1edd \u0111\u1eb7t t\u00ean b\u1ea3ng ho\u1eb7c c\u1ed9t b\u1eb1ng c\u00e1c t\u1eeb kh\u00f3a \u0111\u01b0\u1ee3c b\u1ea3o l\u01b0u trong c\u01a1 s\u1edf d\u1eef li\u1ec7u (v\u00ed d\u1ee5 nh\u01b0 Nh\u00f3m<\/em>, Ch\u1ecdn<\/em>, \u0110\u01a1n h\u00e0ng<\/em>). \u0110i\u1ec1u n\u00e0y ng\u0103n ch\u1eb7n l\u1ed7i c\u00fa ph\u00e1p trong qu\u00e1 tr\u00ecnh t\u1ea1o truy v\u1ea5n.<\/li>\n
        • Ti\u1ec1n t\u1ed1 cho Metadata:<\/strong> S\u1eed d\u1ee5ng ti\u1ec1n t\u1ed1 nh\u01b0 _audit<\/em>, _log<\/em>, ho\u1eb7c _temp<\/em> \u0111\u1ec3 ph\u00e2n bi\u1ec7t c\u00e1c b\u1ea3ng ph\u1ee5 tr\u1ee3 v\u1edbi c\u00e1c th\u1ef1c th\u1ec3 kinh doanh ch\u00ednh.<\/li>\n<\/ul>\n

          Quy t\u1eafc \u0111\u1eb7t t\u00ean c\u1ed9t<\/h3>\n
            \n
          • Kh\u00f3a ngo\u1ea1i:<\/strong> R\u00f5 r\u00e0ng ch\u1ec9 ra m\u1ed1i quan h\u1ec7. N\u1ebfu m\u1ed9t c\u1ed9t tham chi\u1ebfu \u0111\u1ebfn b\u1ea3ng Users<\/em> th\u00ec \u0111\u1eb7t t\u00ean l\u00e0 user_id<\/em> thay v\u00ec uid<\/em> ho\u1eb7c fk_user<\/em>.<\/li>\n
          • C\u1edd Boolean:<\/strong> S\u1eed d\u1ee5ng ti\u1ec1n t\u1ed1 nh\u01b0 is_<\/em> ho\u1eb7c has_<\/em>. V\u00ed d\u1ee5, is_active<\/em> ho\u1eb7c has_subscription<\/em>.<\/li>\n
          • C\u00e1c tr\u01b0\u1eddng ng\u00e0y gi\u1edd:<\/strong>X\u00e1c \u0111\u1ecbnh ph\u1ea1m vi. S\u1eed d\u1ee5ng created_at<\/em> ho\u1eb7c updated_at<\/em> thay v\u00ec s\u1eed d\u1ee5ng ng\u00e0y<\/em> ho\u1eb7c gi\u1edd<\/em>.<\/li>\n<\/ul>\n

            M\u1ed1i quan h\u1ec7 v\u00e0 t\u00ednh cardinality \ud83d\udd04<\/h2>\n

            Hi\u1ec3u \u0111\u01b0\u1ee3c t\u00ednh cardinality l\u00e0 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa m\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u ho\u1ea1t \u0111\u1ed9ng t\u1ed1t v\u00e0 m\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u b\u1ecb h\u1ecfng. T\u00ednh cardinality x\u00e1c \u0111\u1ecbnh ch\u00ednh x\u00e1c s\u1ed1 l\u01b0\u1ee3ng c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 c\u00f3 th\u1ec3 ho\u1eb7c ph\u1ea3i \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi m\u1ed7i th\u1ec3 hi\u1ec7n c\u1ee7a th\u1ef1c th\u1ec3 kh\u00e1c.<\/p>\n

            C\u00e1c lo\u1ea1i m\u1ed1i quan h\u1ec7<\/h3>\n
              \n
            • M\u1ed9t-\u0111\u1ed1i-m\u1ed9t (1:1):<\/strong> M\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 A \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi \u0111\u00fang m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 B. \u0110i\u1ec1u n\u00e0y hi\u1ebfm khi x\u1ea3y ra trong logic kinh doanh c\u1ed1t l\u00f5i nh\u01b0ng ph\u1ed5 bi\u1ebfn \u0111\u1ed1i v\u1edbi d\u1eef li\u1ec7u b\u1ea3o m\u1eadt ho\u1eb7c c\u1ea5u h\u00ecnh. V\u00ed d\u1ee5: M\u1ed9t Ng\u01b0\u1eddi d\u00f9ng<\/em> c\u00f3 m\u1ed9t H\u1ed3 s\u01a1<\/em>.<\/li>\n
            • M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u (1:N):<\/strong> M\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 A \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 B. \u0110\u00e2y l\u00e0 m\u1ed1i quan h\u1ec7 ph\u1ed5 bi\u1ebfn nh\u1ea5t. V\u00ed d\u1ee5: M\u1ed9t Ph\u00f2ng ban<\/em> c\u00f3 nhi\u1ec1u Nh\u00e2n vi\u00ean<\/em>.<\/li>\n
            • Nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u (M:N):<\/strong> Nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 A \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 B. \u0110i\u1ec1u n\u00e0y y\u00eau c\u1ea7u m\u1ed9t b\u1ea3ng li\u00ean k\u1ebft (th\u1ef1c th\u1ec3 li\u00ean k\u1ebft). V\u00ed d\u1ee5: Sinh vi\u00ean<\/em> v\u00e0 Kh\u00f3a h\u1ecdc<\/em>.<\/li>\n<\/ul>\n

              T\u00ednh t\u00f9y ch\u1ecdn v\u00e0 r\u00e0ng bu\u1ed9c<\/h3>\n

              Cardinality kh\u00f4ng k\u1ec3 h\u1ebft to\u00e0n b\u1ed9 c\u00e2u chuy\u1ec7n; t\u00ednh t\u00f9y ch\u1ecdn m\u1edbi l\u00e0 \u0111i\u1ec1u \u0111\u00f3. \u0110i\u1ec1u n\u00e0y \u00e1m ch\u1ec9 m\u1ed1i quan h\u1ec7 l\u00e0 b\u1eaft bu\u1ed9c hay t\u00f9y ch\u1ecdn.<\/p>\n

                \n
              • B\u1eaft bu\u1ed9c (Tham gia b\u1eaft bu\u1ed9c):<\/strong> M\u1ed9t th\u1ec3 hi\u1ec7n th\u1ef1c th\u1ec3 ph\u1ea3i<\/em> \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi m\u1ed9t th\u1ef1c th\u1ec3 kh\u00e1c. V\u00ed d\u1ee5, m\u1ed9t \u0110\u01a1n h\u00e0ng<\/em> ph\u1ea3i<\/em> c\u00f3 m\u1ed9t Kh\u00e1ch h\u00e0ng<\/em>.<\/li>\n
              • T\u00f9y ch\u1ecdn (Tham gia t\u00f9y ch\u1ecdn):<\/strong> M\u1ed9t th\u1ec3 hi\u1ec7n th\u1ef1c th\u1ec3 c\u00f3 th\u1ec3<\/em> t\u1ed3n t\u1ea1i m\u00e0 kh\u00f4ng c\u1ea7n c\u00f3 m\u1ed1i quan h\u1ec7. V\u00ed d\u1ee5, m\u1ed9t S\u1ea3n ph\u1ea9m<\/em> c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i m\u00e0 kh\u00f4ng c\u1ea7n m\u1ed9t \u0110\u01a1n h\u00e0ng<\/em> b\u1ea3n ghi n\u00e0o c\u1ea3.<\/li>\n<\/ul>\n

                Th\u1ef1c thi c\u00e1c quy t\u1eafc n\u00e0y \u1edf c\u1ea5p \u0111\u1ed9 c\u01a1 s\u1edf d\u1eef li\u1ec7u b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng r\u00e0ng bu\u1ed9c (NOT NULL, Kh\u00f3a ngo\u1ea1i) \u0111\u00e1ng tin c\u1eady h\u01a1n nhi\u1ec1u so v\u1edbi vi\u1ec7c th\u1ef1c thi ch\u00fang trong m\u00e3 \u1ee9ng d\u1ee5ng. \u0110i\u1ec1u n\u00e0y b\u1ea3o v\u1ec7 ch\u1ed1ng l\u1ea1i s\u1ef1 l\u1ec7ch l\u1ea1c d\u1eef li\u1ec7u v\u00e0 \u0111\u1ea3m b\u1ea3o r\u1eb1ng l\u01b0\u1ee3c \u0111\u1ed3 v\u1eabn l\u00e0 ngu\u1ed3n th\u00f4ng tin ch\u00ednh x\u00e1c.<\/p>\n

                Qu\u1ea3n l\u00fd l\u01b0\u1ee3c \u0111\u1ed3 v\u00e0 ki\u1ec3m so\u00e1t phi\u00ean b\u1ea3n \ud83d\udcdc<\/h2>\n

                Trong m\u00f4i tr\u01b0\u1eddng doanh nghi\u1ec7p, l\u01b0\u1ee3c \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u l\u00e0 m\u00e3 ngu\u1ed3n. N\u00f3 ph\u1ea3i \u0111\u01b0\u1ee3c g\u00e1n phi\u00ean b\u1ea3n, xem x\u00e9t v\u00e0 qu\u1ea3n l\u00fd v\u1edbi c\u00f9ng m\u1ee9c \u0111\u1ed9 nghi\u00eam ng\u1eb7t nh\u01b0 m\u00e3 ngu\u1ed3n \u1ee9ng d\u1ee5ng. M\u1ed9t s\u01a1 \u0111\u1ed3 ERD kh\u00f4ng ph\u1ea3i l\u00e0 t\u00e0i li\u1ec7u t\u0129nh; n\u00f3 thay \u0111\u1ed5i theo s\u1ef1 thay \u0111\u1ed5i y\u00eau c\u1ea7u kinh doanh.<\/p>\n

                Chi\u1ebfn l\u01b0\u1ee3c di chuy\u1ec3n<\/h3>\n
                  \n
                • T\u00ednh t\u01b0\u01a1ng th\u00edch ng\u01b0\u1ee3c chi\u1ec1u:<\/strong> C\u00e1c thay \u0111\u1ed5i n\u00ean \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 h\u1ed7 tr\u1ee3 d\u1eef li\u1ec7u c\u0169. Tr\u00e1nh x\u00f3a c\u00e1c c\u1ed9t ngay l\u1eadp t\u1ee9c; thay v\u00e0o \u0111\u00f3, \u0111\u00e1nh d\u1ea5u ch\u00fang l\u00e0 \u0111\u00e3 l\u1ed7i th\u1eddi.<\/li>\n
                • T\u00ednh t\u01b0\u01a1ng th\u00edch ng\u01b0\u1ee3c:<\/strong> C\u00e1c phi\u00ean b\u1ea3n l\u01b0\u1ee3c \u0111\u1ed3 m\u1edbi kh\u00f4ng n\u00ean l\u00e0m h\u1ecfng c\u00e1c truy v\u1ea5n hi\u1ec7n t\u1ea1i. S\u1eed d\u1ee5ng c\u00e1c view \u0111\u1ec3 che gi\u1ea5u c\u00e1c thay \u0111\u1ed5i kh\u1ecfi l\u1edbp \u1ee9ng d\u1ee5ng.<\/li>\n
                • C\u00e1c thay \u0111\u1ed5i nguy\u00ean t\u1eed:<\/strong> M\u1ed7i t\u1eadp l\u1ec7nh di chuy\u1ec3n n\u00ean \u0111\u1ea1i di\u1ec7n cho m\u1ed9t thay \u0111\u1ed5i logic duy nh\u1ea5t. \u0110i\u1ec1u n\u00e0y gi\u00fap vi\u1ec7c ho\u00e0n t\u00e1c d\u1ec5 d\u00e0ng h\u01a1n n\u1ebfu x\u1ea3y ra l\u1ed7i.<\/li>\n<\/ul>\n

                  B\u1ea3o tr\u00ec t\u00e0i li\u1ec7u<\/h3>\n

                  M\u1ed9t s\u01a1 \u0111\u1ed3 ERD kh\u00f4ng \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt l\u00e0 m\u1ed9t r\u1ee7i ro. \u0110\u1ea3m b\u1ea3o quy tr\u00ecnh sinh ra s\u01a1 \u0111\u1ed3 \u0111\u01b0\u1ee3c t\u1ef1 \u0111\u1ed9ng h\u00f3a. L\u00fd t\u01b0\u1edfng nh\u1ea5t l\u00e0 s\u01a1 \u0111\u1ed3 ERD n\u00ean \u0111\u01b0\u1ee3c t\u1ea1o tr\u1ef1c ti\u1ebfp t\u1eeb c\u00e1c t\u1ec7p \u0111\u1ecbnh ngh\u0129a l\u01b0\u1ee3c \u0111\u1ed3 (DML) \u0111\u1ec3 ng\u0103n s\u1ef1 l\u1ec7ch l\u1ea1c gi\u1eefa t\u00e0i li\u1ec7u v\u00e0 tr\u1ea1ng th\u00e1i c\u01a1 s\u1edf d\u1eef li\u1ec7u th\u1ef1c t\u1ebf.<\/p>\n

                    \n
                  • T\u1ef1 \u0111\u1ed9ng h\u00f3a vi\u1ec7c sinh s\u01a1 \u0111\u1ed3 ERD cho m\u1ed7i l\u1ea7n ghi l\u1ea1i thay \u0111\u1ed5i.<\/li>\n
                  • Y\u00eau c\u1ea7u xem x\u00e9t l\u01b0\u1ee3c \u0111\u1ed3 trong quy tr\u00ecnh y\u00eau c\u1ea7u h\u1ee3p nh\u1ea5t.<\/li>\n
                  • G\u1eafn th\u1ebb c\u00e1c phi\u00ean b\u1ea3n l\u01b0\u1ee3c \u0111\u1ed3 ch\u00ednh \u0111\u1ec3 li\u00ean k\u1ebft v\u1edbi c\u00e1c phi\u00ean b\u1ea3n \u1ee9ng d\u1ee5ng.<\/li>\n<\/ul>\n

                    C\u00e1c c\u00e2n nh\u1eafc v\u1ec1 b\u1ea3o m\u1eadt v\u00e0 quy\u1ec1n ri\u00eang t\u01b0 \ud83d\udd12<\/h2>\n

                    C\u00e1c n\u1ec1n t\u1ea3ng doanh nghi\u1ec7p x\u1eed l\u00fd th\u00f4ng tin nh\u1ea1y c\u1ea3m. Giai \u0111o\u1ea1n thi\u1ebft k\u1ebf s\u01a1 \u0111\u1ed3 ERD ph\u1ea3i t\u00ednh \u0111\u1ebfn c\u00e1c y\u00eau c\u1ea7u b\u1ea3o m\u1eadt v\u00e0 quy\u1ec1n ri\u00eang t\u01b0, \u0111\u1eb7c bi\u1ec7t l\u00e0 \u0111\u1ed1i v\u1edbi Th\u00f4ng tin nh\u1eadn d\u1ea1ng c\u00e1 nh\u00e2n (PII).<\/p>\n

                    Ph\u00e2n lo\u1ea1i d\u1eef li\u1ec7u<\/h3>\n
                      \n
                    • D\u1eef li\u1ec7u c\u00f4ng khai:<\/strong>Th\u00f4ng tin c\u00f3 th\u1ec3 chia s\u1ebb c\u00f4ng khai. Kh\u00f4ng c\u1ea7n x\u1eed l\u00fd \u0111\u1eb7c bi\u1ec7t.<\/li>\n
                    • D\u1eef li\u1ec7u n\u1ed9i b\u1ed9:<\/strong>Th\u00f4ng tin d\u00e0nh ri\u00eang cho nh\u00e2n vi\u00ean. C\u1ea7n xem x\u00e9t danh s\u00e1ch ki\u1ec3m so\u00e1t truy c\u1eadp (ACL).<\/li>\n
                    • D\u1eef li\u1ec7u b\u1ecb h\u1ea1n ch\u1ebf:<\/strong>D\u1eef li\u1ec7u nh\u1ea1y c\u1ea3m nh\u01b0 m\u1eadt kh\u1ea9u, h\u1ed3 s\u01a1 s\u1ee9c kh\u1ecfe ho\u1eb7c chi ti\u1ebft t\u00e0i ch\u00ednh. C\u00e1c tr\u01b0\u1eddng n\u00e0y y\u00eau c\u1ea7u m\u00e3 h\u00f3a khi l\u01b0u tr\u1eef v\u00e0 khi truy\u1ec1n t\u1ea3i.<\/li>\n<\/ul>\n

                      Che gi\u1ea5u v\u00e0 v\u00f4 danh h\u00f3a<\/h3>\n

                      Trong s\u01a1 \u0111\u1ed3 ERD, \u0111\u00e1nh d\u1ea5u c\u00e1c tr\u01b0\u1eddng y\u00eau c\u1ea7u che gi\u1ea5u trong m\u00f4i tr\u01b0\u1eddng kh\u00f4ng s\u1ea3n xu\u1ea5t. \u0110i\u1ec1u n\u00e0y gi\u00fap c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n hi\u1ec3u \u0111\u01b0\u1ee3c c\u1ed9t n\u00e0o c\u1ea7n x\u1eed l\u00fd \u0111\u1eb7c bi\u1ec7t trong qu\u00e1 tr\u00ecnh ki\u1ec3m th\u1eed. M\u1eb7c d\u00f9 s\u01a1 \u0111\u1ed3 b\u1ea3n th\u00e2n kh\u00f4ng th\u1ef1c thi b\u1ea3o m\u1eadt, nh\u01b0ng n\u00f3 h\u01b0\u1edbng d\u1eabn vi\u1ec7c tri\u1ec3n khai c\u00e1c ch\u00ednh s\u00e1ch b\u1ea3o m\u1eadt.<\/p>\n

                        \n
                      • X\u00e1c \u0111\u1ecbnh r\u00f5 r\u00e0ng c\u00e1c c\u1ed9t ch\u1ee9a PII.<\/li>\n
                      • X\u00e1c \u0111\u1ecbnh c\u00e1c tr\u01b0\u1eddng ghi nh\u1eadt k\u00fd (v\u00ed d\u1ee5 nh\u01b0 last_modified_by<\/em>) \u0111\u1ec3 theo d\u00f5i ai \u0111\u00e3 truy c\u1eadp ho\u1eb7c thay \u0111\u1ed5i d\u1eef li\u1ec7u.<\/li>\n
                      • \u0110\u1ea3m b\u1ea3o c\u00e1c kh\u00f3a ngo\u1ea1i kh\u00f4ng ti\u1ebft l\u1ed9 c\u00e1c ID n\u1ed9i b\u1ed9 c\u00f3 th\u1ec3 b\u1ecb \u0111\u1ebfm \u0111\u01b0\u1ee3c.<\/li>\n<\/ul>\n

                        L\u1eadp k\u1ebf ho\u1ea1ch hi\u1ec7u su\u1ea5t v\u00e0 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng \ud83d\ude80<\/h2>\n

                        M\u1eb7c d\u00f9 s\u01a1 \u0111\u1ed3 ERD t\u1eadp trung v\u00e0o c\u1ea5u tr\u00fac, nh\u01b0ng n\u00f3 c\u0169ng ph\u1ea3i xem x\u00e9t hi\u1ec7u su\u1ea5t. M\u1ed9t l\u01b0\u1ee3c \u0111\u1ed3 h\u1ee3p l\u00fd v\u1ec1 m\u1eb7t logic nh\u01b0ng ch\u1eadm v\u1ec1 m\u1eb7t v\u1eadt l\u00fd s\u1ebd th\u1ea5t b\u1ea1i khi ch\u1ecbu t\u1ea3i.<\/p>\n

                        Chi\u1ebfn l\u01b0\u1ee3c ch\u1ec9 m\u1ee5c<\/h3>\n

                        C\u00e1c m\u1ed1i quan h\u1ec7 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong s\u01a1 \u0111\u1ed3 ERD x\u00e1c \u0111\u1ecbnh n\u01a1i c\u1ea7n c\u00f3 ch\u1ec9 m\u1ee5c. C\u00e1c kh\u00f3a ngo\u1ea1i n\u00ean \u0111\u01b0\u1ee3c ch\u1ec9 m\u1ee5c \u0111\u1ec3 t\u0103ng t\u1ed1c \u0111\u1ed9 th\u1ef1c hi\u1ec7n ph\u00e9p n\u1ed1i v\u00e0 ki\u1ec3m tra r\u00e0ng bu\u1ed9c. Tuy nhi\u00ean, ch\u1ec9 m\u1ee5c qu\u00e1 nhi\u1ec1u c\u00f3 th\u1ec3 l\u00e0m ch\u1eadm c\u00e1c thao t\u00e1c ghi.<\/p>\n

                          \n
                        • Kh\u00f3a ch\u00ednh:<\/strong>Lu\u00f4n \u0111\u01b0\u1ee3c ch\u1ec9 m\u1ee5c.<\/li>\n
                        • Kh\u00f3a ngo\u1ea1i:<\/strong>Lu\u00f4n \u0111\u01b0\u1ee3c ch\u1ec9 m\u1ee5c \u0111\u1ec3 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t ph\u00e9p n\u1ed1i.<\/li>\n
                        • C\u00e1c c\u1ed9t t\u00ecm ki\u1ebfm:<\/strong> C\u00e1c c\u1ed9t th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c m\u1ec7nh \u0111\u1ec1 WHERE n\u00ean c\u00f3 ch\u1ec9 m\u1ee5c.<\/li>\n<\/ul>\n

                          Chia t\u00e1ch v\u00e0 ph\u00e2n m\u1ea3nh<\/h3>\n

                          \u0110\u1ed1i v\u1edbi c\u00e1c t\u1eadp d\u1eef li\u1ec7u kh\u1ed5ng l\u1ed3, ERD c\u00f3 th\u1ec3 g\u1ee3i \u00fd c\u00e1c chi\u1ebfn l\u01b0\u1ee3c chia t\u00e1ch. N\u1ebfu d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c nh\u00f3m t\u1ef1 nhi\u00ean (v\u00ed d\u1ee5: theo V\u00f9ng<\/em> ho\u1eb7c Ng\u00e0y<\/em>), \u0111i\u1ec1u n\u00e0y n\u00ean \u0111\u01b0\u1ee3c ph\u1ea3n \u00e1nh trong thi\u1ebft k\u1ebf l\u01b0\u1ee3c \u0111\u1ed3. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p c\u01a1 s\u1edf d\u1eef li\u1ec7u ph\u00e2n ph\u1ed1i t\u1ea3i across nhi\u1ec1u n\u00fat v\u1eadt l\u00fd.<\/p>\n

                          Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ea7n tr\u00e1nh \u26a0\ufe0f<\/h2>\n

                          Ngay c\u1ea3 c\u00e1c \u0111\u1ed9i ng\u0169 c\u00f3 kinh nghi\u1ec7m c\u0169ng m\u1eafc sai l\u1ea7m. Nh\u1eadn di\u1ec7n c\u00e1c m\u1eabu th\u1ea5t b\u1ea1i ph\u1ed5 bi\u1ebfn s\u1ebd gi\u00fap x\u00e2y d\u1ef1ng h\u1ec7 th\u1ed1ng b\u1ec1n v\u1eefng.<\/p>\n

                            \n
                          • Tham chi\u1ebfu v\u00f2ng:<\/strong>Tr\u00e1nh c\u00e1c m\u1ed1i quan h\u1ec7 n\u01a1i Entiti A ph\u1ee5 thu\u1ed9c v\u00e0o B, v\u00e0 B ph\u1ee5 thu\u1ed9c v\u00e0o A, t\u1ea1o th\u00e0nh v\u00f2ng l\u1eb7p l\u00e0m ph\u1ee9c t\u1ea1p vi\u1ec7c x\u00f3a ho\u1eb7c c\u1eadp nh\u1eadt d\u1eef li\u1ec7u.<\/li>\n
                          • Thi\u1ebfu r\u00e0ng bu\u1ed9c:<\/strong>D\u1ef1a v\u00e0o m\u00e3 \u1ee9ng d\u1ee5ng \u0111\u1ec3 th\u1ef1c thi quy t\u1eafc (v\u00ed d\u1ee5: \u0111\u1ea3m b\u1ea3o m\u1ed9t Gi\u00e1<\/em> l\u00e0 d\u01b0\u01a1ng) l\u00e0 r\u1ee7i ro. H\u00e3y s\u1eed d\u1ee5ng r\u00e0ng bu\u1ed9c CHECK trong c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/li>\n
                          • Qu\u00e1 thi\u1ebft k\u1ebf:<\/strong>\u0110\u1eebng m\u00f4 h\u00ecnh h\u00f3a m\u1ecdi t\u00ecnh hu\u1ed1ng t\u01b0\u01a1ng lai c\u00f3 th\u1ec3 x\u1ea3y ra. Thi\u1ebft k\u1ebf cho c\u00e1c y\u00eau c\u1ea7u hi\u1ec7n t\u1ea1i v\u1edbi \u0111\u1ee7 linh ho\u1ea1t \u0111\u1ec3 th\u00edch nghi, nh\u01b0ng tr\u00e1nh t\u1ea1o b\u1ea3ng cho c\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng gi\u1ea3 \u0111\u1ecbnh.<\/li>\n
                          • Gi\u00e1 tr\u1ecb \u0111\u01b0\u1ee3c ghi c\u1ee9ng:<\/strong>Tr\u00e1nh l\u01b0u m\u00e3 tr\u1ea1ng th\u00e1i d\u01b0\u1edbi d\u1ea1ng s\u1ed1 nguy\u00ean m\u00e0 kh\u00f4ng c\u00f3 b\u1ea3ng tra c\u1ee9u. S\u1eed d\u1ee5ng b\u1ea3ng tham chi\u1ebfu cho c\u00e1c tr\u1ea1ng th\u00e1i nh\u01b0 Tr\u1ea1ngTh\u00e1i\u0110\u01a1nH\u00e0ng<\/em> \u0111\u1ec3 duy tr\u00ec s\u1ef1 r\u00f5 r\u00e0ng.<\/li>\n<\/ul>\n

                            Th\u1ef1c hi\u1ec7n c\u00e1c ti\u00eau chu\u1ea9n trong quy tr\u00ecnh l\u00e0m vi\u1ec7c c\u1ee7a b\u1ea1n \ud83d\udee0\ufe0f<\/h2>\n

                            Vi\u1ec7c \u00e1p d\u1ee5ng c\u00e1c ti\u00eau chu\u1ea9n n\u00e0y \u0111\u00f2i h\u1ecfi s\u1ef1 thay \u0111\u1ed5i trong v\u0103n h\u00f3a. Kh\u00f4ng \u0111\u1ee7 ch\u1ec9 \u0111\u01a1n gi\u1ea3n v\u1ebd m\u1ed9t s\u01a1 \u0111\u1ed3; s\u01a1 \u0111\u1ed3 \u0111\u00f3 ph\u1ea3i th\u00fac \u0111\u1ea9y qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n.<\/p>\n

                              \n
                            • Thi\u1ebft k\u1ebf tr\u01b0\u1edbc:<\/strong>Y\u00eau c\u1ea7u ERD \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t tr\u01b0\u1edbc khi vi\u1ebft b\u1ea5t k\u1ef3 k\u1ecbch b\u1ea3n di chuy\u1ec3n n\u00e0o.<\/li>\n
                            • Xem x\u00e9t m\u00e3 ngu\u1ed3n:<\/strong>Bao g\u1ed3m c\u00e1c thay \u0111\u1ed5i l\u01b0\u1ee3c \u0111\u1ed3 trong danh s\u00e1ch ki\u1ec3m tra xem x\u00e9t m\u00e3 ngu\u1ed3n ti\u00eau chu\u1ea9n.<\/li>\n
                            • \u0110\u00e0o t\u1ea1o:<\/strong>\u0110\u1ea3m b\u1ea3o t\u1ea5t c\u1ea3 c\u00e1c k\u1ef9 s\u01b0 backend hi\u1ec3u r\u00f5 c\u00e1c kh\u00e1i ni\u1ec7m chu\u1ea9n h\u00f3a v\u00e0 c\u1ea5p \u0111\u1ed9.<\/li>\n
                            • C\u00f4ng c\u1ee5:<\/strong>\u0110\u1ea7u t\u01b0 v\u00e0o c\u00e1c c\u00f4ng c\u1ee5 thi\u1ebft k\u1ebf l\u01b0\u1ee3c \u0111\u1ed3 h\u1ed7 tr\u1ee3 h\u1ee3p t\u00e1c v\u00e0 qu\u1ea3n l\u00fd phi\u00ean b\u1ea3n.<\/li>\n<\/ul>\n

                              B\u1eb1ng c\u00e1ch coi s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 l\u00e0 m\u1ed9t th\u00e0nh ph\u1ea7n s\u1ed1ng \u0111\u1ed9ng, c\u00f3 s\u1ef1 hi\u1ec7n di\u1ec7n trong ki\u1ebfn tr\u00fac h\u1ec7 th\u1ed1ng, c\u00e1c \u0111\u1ed9i ng\u0169 doanh nghi\u1ec7p c\u00f3 th\u1ec3 \u0111\u1ea3m b\u1ea3o c\u00e1c l\u1edbp d\u1eef li\u1ec7u c\u1ee7a h\u1ecd lu\u00f4n v\u1eefng ch\u1eafc. N\u1ed7 l\u1ef1c \u0111\u1ea7u t\u01b0 v\u00e0o vi\u1ec7c chu\u1ea9n h\u00f3a giai \u0111o\u1ea1n thi\u1ebft k\u1ebf s\u1ebd mang l\u1ea1i l\u1ee3i \u00edch r\u00f5 r\u1ec7t trong vi\u1ec7c gi\u1ea3m n\u1ee3 k\u1ef9 thu\u1eadt v\u00e0 n\u00e2ng cao \u0111\u1ed9 tin c\u1eady c\u1ee7a h\u1ec7 th\u1ed1ng. M\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c c\u1ea5u tr\u00fac t\u1ed1t l\u00e0 n\u1ec1n t\u1ea3ng v\u1eefng ch\u1eafc cho vi\u1ec7c x\u00e2y d\u1ef1ng c\u00e1c \u1ee9ng d\u1ee5ng c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng.<\/p>\n

                              Khi b\u1ea1n \u01b0u ti\u00ean s\u1ef1 r\u00f5 r\u00e0ng, nh\u1ea5t qu\u00e1n v\u00e0 to\u00e0n v\u1eb9n trong m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u, b\u1ea1n s\u1ebd t\u1ea1o n\u00ean m\u1ed9t n\u1ec1n t\u1ea3ng h\u1ed7 tr\u1ee3 s\u1ef1 ph\u00e1t tri\u1ec3n. C\u00e1c ti\u00eau chu\u1ea9n \u0111\u01b0\u1ee3c n\u00eau \u1edf \u0111\u00e2y cung c\u1ea5p m\u1ed9t khung n\u1ec1n t\u1ea3ng cho \u0111i\u1ec1u \u0111\u00f3. Vi\u1ec7c tu\u00e2n theo ch\u00fang \u0111\u1ea3m b\u1ea3o backend c\u1ee7a b\u1ea1n lu\u00f4n d\u1ec5 b\u1ea3o tr\u00ec, an to\u00e0n v\u00e0 hi\u1ec7u qu\u1ea3 khi t\u1ed5 ch\u1ee9c c\u1ee7a b\u1ea1n m\u1edf r\u1ed9ng.<\/p>\n","protected":false},"excerpt":{"rendered":"

                              Thi\u1ebft k\u1ebf ki\u1ebfn tr\u00fac d\u1eef li\u1ec7u cho m\u1ed9t h\u1ec7 th\u1ed1ng backend quy m\u00f4 l\u1edbn l\u00e0 m\u1ed9t nhi\u1ec7m v\u1ee5 n\u1ec1n t\u1ea3ng quy\u1ebft \u0111\u1ecbnh \u0111\u1ebfn \u0111\u1ed9 b\u1ec1n v\u00e0 s\u1ef1 \u1ed5n \u0111\u1ecbnh c\u1ee7a…<\/p>\n","protected":false},"author":1,"featured_media":1634,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"H\u01b0\u1edbng d\u1eabn Ti\u00eau chu\u1ea9n ERD cho Backend Doanh nghi\u1ec7p","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1c ti\u00eau chu\u1ea9n ERD thi\u1ebft y\u1ebfu cho backend doanh nghi\u1ec7p. Bao g\u1ed3m chu\u1ea9n h\u00f3a, k\u00fd hi\u1ec7u, quy t\u1eafc \u0111\u1eb7t t\u00ean v\u00e0 c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t v\u1ec1 to\u00e0n v\u1eb9n d\u1eef li\u1ec7u cho c\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[68],"tags":[89,92],"class_list":["post-1633","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-database-design","tag-academic","tag-erd"],"yoast_head":"\nH\u01b0\u1edbng d\u1eabn Ti\u00eau chu\u1ea9n ERD cho Backend Doanh nghi\u1ec7p<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1c ti\u00eau chu\u1ea9n ERD thi\u1ebft y\u1ebfu cho backend doanh nghi\u1ec7p. 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