{"id":1520,"date":"2026-03-23T04:06:05","date_gmt":"2026-03-23T04:06:05","guid":{"rendered":"https:\/\/www.ez-knowledge.com\/vi\/translating-business-rules-erd-constraints\/"},"modified":"2026-03-23T04:06:05","modified_gmt":"2026-03-23T04:06:05","slug":"translating-business-rules-erd-constraints","status":"publish","type":"post","link":"https:\/\/www.ez-knowledge.com\/vi\/translating-business-rules-erd-constraints\/","title":{"rendered":"Chuy\u1ec3n \u0111\u1ed5i c\u00e1c quy t\u1eafc kinh doanh th\u00e0nh c\u00e1c r\u00e0ng bu\u1ed9c ERD ch\u00ednh x\u00e1c"},"content":{"rendered":"
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\"Stamp<\/figure>\n<\/div>\n

X\u00e2y d\u1ef1ng m\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u m\u1ea1nh m\u1ebd b\u1eaft \u0111\u1ea7u t\u1eeb r\u1ea5t l\u00e2u tr\u01b0\u1edbc khi d\u00f2ng m\u00e3 \u0111\u1ea7u ti\u00ean \u0111\u01b0\u1ee3c vi\u1ebft ra. N\u00f3 b\u1eaft \u0111\u1ea7u b\u1eb1ng vi\u1ec7c hi\u1ec3u logic c\u1ed1t l\u00f5i \u0111i\u1ec1u khi\u1ec3n ho\u1ea1t \u0111\u1ed9ng c\u1ee7a t\u1ed5 ch\u1ee9c. Khi c\u00e1c b\u00ean li\u00ean quan kinh doanh m\u00f4 t\u1ea3 c\u00e1ch h\u1ec7 th\u1ed1ng ph\u1ea3i ho\u1ea1t \u0111\u1ed9ng, h\u1ecd n\u00f3i theo ng\u00f4n ng\u1eef c\u1ee7a quy tr\u00ecnh, ch\u00ednh s\u00e1ch v\u00e0 c\u00e1c tr\u01b0\u1eddng h\u1ee3p ngo\u1ea1i l\u1ec7. Tuy nhi\u00ean, \u0111\u1ed9i k\u1ef9 thu\u1eadt ph\u1ea3i chuy\u1ec3n \u0111\u1ed5i nh\u1eefng c\u00e2u chuy\u1ec7n n\u00e0y th\u00e0nh c\u00e1c c\u1ea5u tr\u00fac c\u1ee9ng nh\u1eafc, ng\u0103n ng\u1eeba l\u1ed7i ngay t\u1eeb \u0111\u1ea7u. Qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i n\u00e0y ch\u00ednh l\u00e0 c\u1ed1t l\u00f5i c\u1ee7a m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u. N\u00f3 bao g\u1ed3m vi\u1ec7c chuy\u1ec3n \u0111\u1ed5i nh\u1eefng k\u1ef3 v\u1ecdng kinh doanh m\u01a1 h\u1ed3 th\u00e0nh c\u00e1c r\u00e0ng bu\u1ed9c ch\u00ednh x\u00e1c tr\u00ean s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 (ERD). Kh\u00f4ng c\u00f3 s\u1ef1 ch\u00ednh x\u00e1c n\u00e0y, t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u s\u1ebd b\u1ecb \u1ea3nh h\u01b0\u1edfng, d\u1eabn \u0111\u1ebfn l\u1ed7i d\u1eef li\u1ec7u, sai s\u00f3t b\u00e1o c\u00e1o v\u00e0 c\u00e1c s\u1ef1 c\u1ed1 h\u1ec7 th\u1ed1ng t\u1ed1n k\u00e9m x\u1ea3y ra v\u1ec1 sau trong v\u00f2ng \u0111\u1eddi s\u1ea3n ph\u1ea9m.<\/p>\n

M\u1ee5c ti\u00eau kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 t\u1ea1o ra m\u1ed9t s\u01a1 \u0111\u1ed3 tr\u00f4ng \u0111\u00fang. M\u1ee5c ti\u00eau l\u00e0 t\u1ea1o ra m\u1ed9t b\u1ea3n v\u1ebd k\u1ef9 thu\u1eadt gi\u00fap \u0111\u1ea3m b\u1ea3o s\u1ef1 th\u1eadt. Khi c\u00e1c quy t\u1eafc kinh doanh \u0111\u01b0\u1ee3c \u00e1nh x\u1ea1 ch\u00ednh x\u00e1c v\u00e0o c\u00e1c r\u00e0ng bu\u1ed9c c\u01a1 s\u1edf d\u1eef li\u1ec7u, h\u1ec7 th\u1ed1ng s\u1ebd tr\u1edf n\u00ean t\u1ef1 v\u1eadn h\u00e0nh. N\u00f3 s\u1ebd ng\u1eebng ch\u1ea5p nh\u1eadn d\u1eef li\u1ec7u kh\u00f4ng h\u1ee3p l\u1ec7 ngay t\u1ea1i ngu\u1ed3n. B\u00e0i vi\u1ebft n\u00e0y kh\u00e1m ph\u00e1 ph\u01b0\u01a1ng ph\u00e1p k\u1ebft n\u1ed1i kho\u1ea3ng c\u00e1ch gi\u1eefa y\u00eau c\u1ea7u c\u1ee7a con ng\u01b0\u1eddi v\u00e0 logic \u0111\u01b0\u1ee3c th\u1ef1c thi b\u1edfi m\u00e1y t\u00ednh. Ch\u00fang ta s\u1ebd xem x\u00e9t c\u00e1c lo\u1ea1i quy t\u1eafc, c\u00e1ch ch\u00fang \u0111\u01b0\u1ee3c \u00e1nh x\u1ea1 v\u00e0o t\u00ednh to\u00e1n v\u00e0 thu\u1ed9c t\u00ednh, c\u0169ng nh\u01b0 nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn x\u1ea3y ra trong qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i n\u00e0y.<\/p>\n

Hi\u1ec3u r\u00f5 t\u00e0i li\u1ec7u ngu\u1ed3n: C\u00e1c quy t\u1eafc kinh doanh \ud83d\udcdc<\/h2>\n

Tr\u01b0\u1edbc khi x\u00e2y d\u1ef1ng s\u01a1 \u0111\u1ed3 ERD, c\u1ea7n ph\u00e2n t\u00edch k\u1ef9 c\u00e1c y\u00eau c\u1ea7u. C\u00e1c quy t\u1eafc kinh doanh l\u00e0 nh\u1eefng ph\u00e1t bi\u1ec3u c\u1ee5 th\u1ec3, c\u00f3 th\u1ec3 h\u00e0nh \u0111\u1ed9ng v\u00e0 ki\u1ec3m tra \u0111\u01b0\u1ee3c, \u0111\u1ecbnh ngh\u0129a ho\u1eb7c gi\u1edbi h\u1ea1n m\u1ed9t kh\u00eda c\u1ea1nh n\u00e0o \u0111\u00f3 c\u1ee7a ho\u1ea1t \u0111\u1ed9ng kinh doanh. Ch\u00fang l\u00e0 nh\u1eefng lu\u1eadt b\u1ea5t bi\u1ebfn trong l\u0129nh v\u1ef1c d\u1eef li\u1ec7u. N\u1ebfu m\u1ed9t quy t\u1eafc b\u1ecb vi ph\u1ea1m, quy tr\u00ecnh kinh doanh s\u1ebd kh\u00f4ng th\u1ec3 ti\u1ebfp t\u1ee5c. Trong b\u1ed1i c\u1ea3nh m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u, c\u00e1c quy t\u1eafc n\u00e0y \u0111\u01b0\u1ee3c chia th\u00e0nh nhi\u1ec1u nh\u00f3m ri\u00eang bi\u1ec7t.<\/p>\n

    \n
  • C\u00e1c quy t\u1eafc c\u1ea5u tr\u00fac:<\/strong> Ch\u00fang x\u00e1c \u0111\u1ecbnh c\u00e1c th\u1ef1c th\u1ec3 t\u1ed3n t\u1ea1i v\u00e0 c\u00e1ch ch\u00fang li\u00ean k\u1ebft v\u1edbi nhau. V\u00ed d\u1ee5: \u201cM\u1ed7i Kh\u00e1ch h\u00e0ng ph\u1ea3i c\u00f3 \u00edt nh\u1ea5t m\u1ed9t \u0110\u1ecba ch\u1ec9.\u201d\n
  • C\u00e1c quy t\u1eafc thu\u1ed9c t\u00ednh:<\/strong> Ch\u00fang gi\u1edbi h\u1ea1n c\u00e1c \u0111i\u1ec3m d\u1eef li\u1ec7u c\u1ee5 th\u1ec3. V\u00ed d\u1ee5: \u201cNg\u00e0y \u0111\u1eb7t h\u00e0ng ph\u1ea3i tr\u01b0\u1edbc ng\u00e0y giao h\u00e0ng.\u201d\n
  • C\u00e1c quy t\u1eafc m\u1ed1i quan h\u1ec7:<\/strong> Ch\u00fang x\u00e1c \u0111\u1ecbnh t\u00ednh to\u00e1n v\u00e0 s\u1ef1 tham gia. V\u00ed d\u1ee5: \u201cM\u1ed9t S\u1ea3n ph\u1ea9m c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i m\u00e0 kh\u00f4ng c\u1ea7n \u0111\u01a1n \u0111\u1eb7t h\u00e0ng, nh\u01b0ng m\u1ed9t \u0111\u01a1n \u0111\u1eb7t h\u00e0ng ph\u1ea3i ch\u1ee9a \u00edt nh\u1ea5t m\u1ed9t S\u1ea3n ph\u1ea9m.\u201d\n
  • C\u00e1c quy t\u1eafc x\u00e1c th\u1ef1c:<\/strong> Ch\u00fang \u0111\u1ea3m b\u1ea3o \u0111\u1ecbnh d\u1ea1ng v\u00e0 ph\u1ea1m vi d\u1eef li\u1ec7u. V\u00ed d\u1ee5: \u201cTu\u1ed5i ph\u1ea3i l\u00e0 m\u1ed9t s\u1ed1 nguy\u00ean d\u01b0\u01a1ng n\u1eb1m trong kho\u1ea3ng t\u1eeb 0 \u0111\u1ebfn 120.\u201d\n<\/li>\n<\/li>\n<\/li>\n<\/li>\n<\/ul>\n

    M\u1ed7i danh m\u1ee5c n\u00e0y \u0111\u00f2i h\u1ecfi c\u00e1ch ti\u1ebfp c\u1eadn kh\u00e1c nhau khi thi\u1ebft k\u1ebf l\u01b0\u1ee3c \u0111\u1ed3. Vi\u1ec7c kh\u00f4ng nh\u1eadn di\u1ec7n ch\u00fang t\u1eeb s\u1edbm s\u1ebd d\u1eabn \u0111\u1ebfn m\u00f4 h\u00ecnh c\u1ea7n x\u00e1c th\u1ef1c li\u00ean t\u1ee5c sau khi nh\u1eadp d\u1eef li\u1ec7u, \u0111i\u1ec1u n\u00e0y kh\u00f4ng hi\u1ec7u qu\u1ea3 v\u00e0 d\u1ec5 b\u1ecb l\u1ed7i do con ng\u01b0\u1eddi.<\/p>\n

    N\u1ec1n t\u1ea3ng: C\u00e1c th\u1ef1c th\u1ec3 v\u00e0 thu\u1ed9c t\u00ednh \ud83c\udfd7\ufe0f<\/h2>\n

    S\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 m\u00f4 t\u1ea3 th\u1ebf gi\u1edbi theo c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng (th\u1ef1c th\u1ec3) v\u00e0 thu\u1ed9c t\u00ednh c\u1ee7a ch\u00fang (thu\u1ed9c t\u00ednh). Tuy nhi\u00ean, danh s\u00e1ch \u0111\u01a1n gi\u1ea3n c\u00e1c thu\u1ed9c t\u00ednh l\u00e0 ch\u01b0a \u0111\u1ee7. C\u00e1c r\u00e0ng bu\u1ed9c g\u1eafn v\u1edbi c\u00e1c thu\u1ed9c t\u00ednh n\u00e0y s\u1ebd quy\u1ebft \u0111\u1ecbnh ch\u1ea5t l\u01b0\u1ee3ng d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef b\u00ean trong ch\u00fang.<\/p>\n

    X\u00e1c \u0111\u1ecbnh kh\u00f3a ch\u00ednh<\/h3>\n

    M\u1ed7i th\u1ef1c th\u1ec3 kinh doanh c\u1ea7n m\u1ed9t \u0111\u1ecbnh danh duy nh\u1ea5t. Tr\u00ean th\u1ef1c t\u1ebf, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 l\u00e0 S\u1ed1 b\u1ea3o hi\u1ec3m x\u00e3 h\u1ed9i, M\u00e3 h\u1ed9 chi\u1ebfu ho\u1eb7c UUID \u0111\u01b0\u1ee3c sinh ra. Trong s\u01a1 \u0111\u1ed3 ERD, \u0111i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c chuy\u1ec3n th\u00e0nh r\u00e0ng bu\u1ed9c Kh\u00f3a ch\u00ednh. Quy t\u1eafc kinh doanh \u1edf \u0111\u00e2y l\u00e0 t\u00ednh duy nh\u1ea5t.<\/p>\n

      \n
    • Quy t\u1eafc kinh doanh:<\/strong> \u201cKh\u00f4ng c\u00f3 hai nh\u00e2n vi\u00ean n\u00e0o \u0111\u01b0\u1ee3c chia s\u1ebb c\u00f9ng m\u1ed9t M\u00e3 nh\u00e2n vi\u00ean.\u201d\n
    • R\u00e0ng bu\u1ed9c ERD:<\/strong> Thu\u1ed9c t\u00ednh ID \u0111\u01b0\u1ee3c \u0111\u00e1nh d\u1ea5u l\u00e0 Kh\u00f3a ch\u00ednh, \u0111\u1ea3m b\u1ea3o t\u00ednh duy nh\u1ea5t \u1edf c\u1ea5p \u0111\u1ed9 c\u01a1 s\u1edf d\u1eef li\u1ec7u.\n
    • T\u1ea1i sao \u0111i\u1ec1u n\u00e0y quan tr\u1ecdng:<\/strong> Kh\u00f4ng c\u00f3 r\u00e0ng bu\u1ed9c n\u00e0y, c\u00e1c b\u1ea3n ghi tr\u00f9ng l\u1eb7p c\u00f3 th\u1ec3 xu\u1ea5t hi\u1ec7n, g\u00e2y nh\u1ea7m l\u1eabn trong l\u01b0\u01a1ng, t\u1ed3n kho ho\u1eb7c d\u1ecbch v\u1ee5 kh\u00e1ch h\u00e0ng.<\/li>\n<\/li>\n<\/li>\n<\/ul>\n

      X\u1eed l\u00fd t\u00ednh c\u00f3 th\u1ec3 r\u1ed7ng v\u00e0 t\u00ednh t\u00f9y ch\u1ecdn<\/h3>\n

      M\u1ed9t trong nh\u1eefng l\u1ed7i chuy\u1ec3n \u0111\u1ed5i ph\u1ed5 bi\u1ebfn nh\u1ea5t li\u00ean quan \u0111\u1ebfn c\u00e1c tr\u01b0\u1eddng b\u1eaft bu\u1ed9c so v\u1edbi c\u00e1c tr\u01b0\u1eddng t\u00f9y ch\u1ecdn. S\u1ef1 ph\u00e2n bi\u1ec7t n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi ch\u1ea5t l\u01b0\u1ee3ng d\u1eef li\u1ec7u. N\u1ebfu m\u1ed9t quy t\u1eafc kinh doanh n\u00eau r\u00f5 m\u1ed9t tr\u01b0\u1eddng l\u00e0 b\u1eaft bu\u1ed9c, l\u01b0\u1ee3c \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u ph\u1ea3i ph\u1ea3n \u00e1nh \u0111i\u1ec1u \u0111\u00f3 th\u00f4ng qua r\u00e0ng bu\u1ed9c NOT NULL.<\/p>\n

        \n
      • Quy t\u1eafc kinh doanh:<\/strong> \u201cM\u1ed7i h\u00f3a \u0111\u01a1n ph\u1ea3i c\u00f3 kh\u00e1ch h\u00e0ng \u0111\u01b0\u1ee3c g\u00e1n.\u201d\n
      • R\u00e0ng bu\u1ed9c ERD:<\/strong> C\u1ed9t kh\u00f3a ngo\u1ea1i CustomerID kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p l\u00e0 NULL.\n
      • Quy t\u1eafc kinh doanh:<\/strong> \u201cH\u1ed3 s\u01a1 ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i m\u00e0 kh\u00f4ng c\u1ea7n h\u00ecnh \u0111\u1ea1i di\u1ec7n.\u201d\n
      • R\u00e0ng bu\u1ed9c ERD:<\/strong> C\u1ed9t ProfilePictureURL cho ph\u00e9p gi\u00e1 tr\u1ecb NULL.\n<\/li>\n<\/li>\n<\/li>\n<\/li>\n<\/ul>\n

        Cho ph\u00e9p NULL \u1edf nh\u1eefng n\u01a1i d\u1eef li\u1ec7u l\u00e0 b\u1eaft bu\u1ed9c s\u1ebd t\u1ea1o ra m\u1ed9t l\u1ed7 h\u1ed5ng nguy hi\u1ec3m. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef c\u00e1c b\u1ea3n ghi kh\u00f4ng \u0111\u1ea7y \u0111\u1ee7, l\u00e0m h\u1ecfng b\u00e1o c\u00e1o v\u00e0 logic \u1ee9ng d\u1ee5ng \u1edf c\u00e1c b\u01b0\u1edbc ti\u1ebfp theo. Ng\u01b0\u1ee3c l\u1ea1i, \u0111\u00e1nh d\u1ea5u c\u00e1c tr\u01b0\u1eddng l\u00e0 NOT NULL khi ch\u00fang l\u00e0 t\u00f9y ch\u1ecdn s\u1ebd g\u00e2y ra c\u00e1c l\u1ed7i kh\u00f4ng c\u1ea7n thi\u1ebft trong qu\u00e1 tr\u00ecnh nh\u1eadp d\u1eef li\u1ec7u.<\/p>\n

        \u00c1nh x\u1ea1 c\u00e1c m\u1ed1i quan h\u1ec7 sang t\u00ednh b\u1ed9i s\u1ed1 \ud83d\udcca<\/h2>\n

        Ph\u1ea7n ph\u1ee9c t\u1ea1p nh\u1ea5t trong thi\u1ebft k\u1ebf ERD l\u00e0 m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3. C\u00e1c quy t\u1eafc kinh doanh th\u01b0\u1eddng quy \u0111\u1ecbnh s\u1ed1 l\u01b0\u1ee3ng b\u1ea3n ghi c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 c\u00f3 th\u1ec3 li\u00ean k\u1ebft v\u1edbi m\u1ed9t th\u1ef1c th\u1ec3 kh\u00e1c. \u0110i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 t\u00ednh b\u1ed9i s\u1ed1. Chuy\u1ec3n \u0111\u1ed5i \u0111i\u1ec1u n\u00e0y sang ERD \u0111\u00f2i h\u1ecfi k\u00fd hi\u1ec7u ch\u00ednh x\u00e1c.<\/p>\n

        M\u1ed1i quan h\u1ec7 m\u1ed9t – m\u1ed9t<\/h3>\n

        \u0110i\u1ec1u n\u00e0y hi\u1ebfm g\u1eb7p trong c\u00e1c h\u1ec7 th\u1ed1ng th\u00f4ng th\u01b0\u1eddng nh\u01b0ng ph\u1ed5 bi\u1ebfn trong c\u00e1c t\u00ecnh hu\u1ed1ng c\u1ee5 th\u1ec3. \u0110i\u1ec1u n\u00e0y ng\u1ee5 \u00fd r\u1eb1ng m\u1ed9t b\u1ea3n ghi trong B\u1ea3ng A li\u00ean k\u1ebft v\u1edbi \u0111\u00fang m\u1ed9t b\u1ea3n ghi trong B\u1ea3ng B.<\/p>\n

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        • V\u00ed d\u1ee5:<\/strong> M\u1ed9t Nh\u00e2n vi\u00ean ch\u1ec9 c\u00f3 th\u1ec3 s\u1edf h\u1eefu m\u1ed9t b\u1eb1ng l\u00e1i xe, v\u00e0 m\u1ed9t b\u1eb1ng l\u00e1i xe ch\u1ec9 \u0111\u01b0\u1ee3c c\u1ea5p cho m\u1ed9t Nh\u00e2n vi\u00ean.<\/li>\n
        • Tri\u1ec3n khai:<\/strong> Kh\u00f3a ngo\u1ea1i trong b\u1ea3ng Nh\u00e2n vi\u00ean tr\u1ecf \u0111\u1ebfn b\u1ea3ng B\u1eb1ng l\u00e1i, v\u1edbi r\u00e0ng bu\u1ed9c duy nh\u1ea5t tr\u00ean kh\u00f3a ngo\u1ea1i \u0111\u00f3.<\/li>\n<\/ul>\n

          M\u1ed1i quan h\u1ec7 m\u1ed9t – nhi\u1ec1u<\/h3>\n

          \u0110\u00e2y l\u00e0 c\u1ea5u tr\u00fac ph\u1ed5 bi\u1ebfn nh\u1ea5t. M\u1ed9t th\u1ef1c th\u1ec3 cha li\u00ean k\u1ebft v\u1edbi nhi\u1ec1u th\u1ef1c th\u1ec3 con.<\/p>\n

            \n
          • V\u00ed d\u1ee5:<\/strong> M\u1ed9t Ph\u00f2ng ban ch\u1ee9a nhi\u1ec1u Nh\u00e2n vi\u00ean, nh\u01b0ng m\u1ed9t Nh\u00e2n vi\u00ean ch\u1ec9 thu\u1ed9c v\u1ec1 m\u1ed9t Ph\u00f2ng ban.<\/li>\n
          • Tri\u1ec3n khai:<\/strong> B\u1ea3ng Nh\u00e2n vi\u00ean ch\u1ee9a m\u1ed9t kh\u00f3a ngo\u1ea1i tham chi\u1ebfu \u0111\u1ebfn b\u1ea3ng Ph\u00f2ng ban. B\u1ea3ng Ph\u00f2ng ban kh\u00f4ng tham chi\u1ebfu \u0111\u1ebfn b\u1ea3ng Nh\u00e2n vi\u00ean.<\/li>\n
          • D\u1ecbch quy t\u1eafc kinh doanh:<\/strong> \u201cM\u1ed9t Nh\u00e2n vi\u00ean kh\u00f4ng th\u1ec3 b\u1ecb x\u00f3a n\u1ebfu h\u1ecd \u0111ang \u0111\u01b0\u1ee3c g\u00e1n v\u00e0o m\u1ed9t Ph\u00f2ng ban.\u201d\n
          • R\u00e0ng bu\u1ed9c:<\/strong> \u0110i\u1ec1u n\u00e0y y\u00eau c\u1ea7u m\u1ed9t quy t\u1eafc to\u00e0n v\u1eb9n tham chi\u1ebfu, th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 quy t\u1eafc \u201cGi\u1eef cha\u201d ho\u1eb7c \u201cH\u1ea1n ch\u1ebf x\u00f3a\u201d.<\/li>\n<\/li>\n<\/ul>\n

            M\u1ed1i quan h\u1ec7 nhi\u1ec1u – nhi\u1ec1u<\/h3>\n

            Khi nhi\u1ec1u b\u1ea3n ghi trong B\u1ea3ng A li\u00ean k\u1ebft v\u1edbi nhi\u1ec1u b\u1ea3n ghi trong B\u1ea3ng B, th\u00ec li\u00ean k\u1ebft tr\u1ef1c ti\u1ebfp l\u00e0 kh\u00f4ng th\u1ec3 trong m\u00f4 h\u00ecnh quan h\u1ec7 ti\u00eau chu\u1ea9n. \u0110i\u1ec1u n\u00e0y \u0111\u00f2i h\u1ecfi m\u1ed9t th\u1ef1c th\u1ec3 li\u00ean k\u1ebft (b\u1ea3ng giao nhau).<\/p>\n

              \n
            • V\u00ed d\u1ee5:<\/strong> Sinh vi\u00ean \u0111\u0103ng k\u00fd v\u00e0o c\u00e1c Kh\u00f3a h\u1ecdc. M\u1ed9t Sinh vi\u00ean tham gia nhi\u1ec1u Kh\u00f3a h\u1ecdc. M\u1ed9t Kh\u00f3a h\u1ecdc c\u00f3 nhi\u1ec1u Sinh vi\u00ean.<\/li>\n
            • Tri\u1ec3n khai:<\/strong> T\u1ea1o m\u1ed9t th\u1ef1c th\u1ec3 \u201c\u0110\u0103ng k\u00fd\u201d ch\u1ee9a StudentID v\u00e0 CourseID. \u0110i\u1ec1u n\u00e0y chia m\u1ed1i quan h\u1ec7 nhi\u1ec1u – nhi\u1ec1u th\u00e0nh hai m\u1ed1i quan h\u1ec7 m\u1ed9t – nhi\u1ec1u.<\/li>\n
            • D\u1ecbch quy t\u1eafc kinh doanh:<\/strong> \u201cM\u1ed9t sinh vi\u00ean kh\u00f4ng th\u1ec3 \u0111\u0103ng k\u00fd v\u00e0o m\u1ed9t kh\u00f3a h\u1ecdc n\u1ebfu kh\u00f3a h\u1ecdc \u0111\u00f3 \u0111\u00e3 \u0111\u1ea7y.\u201d\n
            • R\u00e0ng bu\u1ed9c:<\/strong> \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng \u0111\u00f2i h\u1ecfi m\u1ed9t r\u00e0ng bu\u1ed9c ki\u1ec3m tra ho\u1eb7c m\u1ed9t trigger tr\u00ean b\u1ea3ng \u0110\u0103ng k\u00fd \u0111\u1ec3 x\u00e1c minh kh\u1ea3 n\u0103ng ch\u1ed7 tr\u1ed1ng.<\/li>\n<\/li>\n<\/ul>\n

              R\u00e0ng bu\u1ed9c n\u00e2ng cao: R\u00e0ng bu\u1ed9c ki\u1ec3m tra v\u00e0 quy t\u1eafc mi\u1ec1n \ud83d\udd12<\/h2>\n

              Kh\u00f4ng ph\u1ea3i m\u1ecdi quy t\u1eafc n\u00e0o c\u0169ng ph\u00f9 h\u1ee3p v\u1edbi kh\u00f3a hay m\u1ed1i quan h\u1ec7. M\u1ed9t s\u1ed1 quy t\u1eafc li\u00ean quan \u0111\u1ebfn c\u00e1c gi\u00e1 tr\u1ecb th\u1ef1c s\u1ef1 \u0111\u01b0\u1ee3c l\u01b0u trong c\u00e1c c\u1ed9t. Nh\u1eefng quy t\u1eafc n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 r\u00e0ng bu\u1ed9c ki\u1ec3m tra ho\u1eb7c r\u00e0ng bu\u1ed9c mi\u1ec1n.<\/p>\n

              H\u00e3y xem x\u00e9t m\u1ed9t quy t\u1eafc li\u00ean quan \u0111\u1ebfn d\u1eef li\u1ec7u t\u00e0i ch\u00ednh. Doanh nghi\u1ec7p c\u00f3 th\u1ec3 n\u00eau r\u1eb1ng chi\u1ebft kh\u1ea5u kh\u00f4ng \u0111\u01b0\u1ee3c v\u01b0\u1ee3t qu\u00e1 gi\u00e1 tr\u1ecb t\u1ed5ng c\u1ed9ng c\u1ee7a m\u1eb7t h\u00e0ng. Trong m\u1ed9t s\u01a1 \u0111\u1ed3 ERD ti\u00eau chu\u1ea9n, quy t\u1eafc n\u00e0y th\u01b0\u1eddng b\u1ecb b\u1ecf qua cho \u0111\u1ebfn khi l\u1edbp \u1ee9ng d\u1ee5ng \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng. \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n, logic n\u00e0y n\u00ean \u0111\u01b0\u1ee3c m\u00f4 h\u00ecnh h\u00f3a nh\u01b0 m\u1ed9t r\u00e0ng bu\u1ed9c trong \u0111\u1ecbnh ngh\u0129a d\u1eef li\u1ec7u.<\/p>\n

                \n
              • Quy t\u1eafc kinh doanh:<\/strong> \u201cT\u1ef7 l\u1ec7 chi\u1ebft kh\u1ea5u kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n 100%.\u201d\n
              • R\u00e0ng bu\u1ed9c ERD:<\/strong> M\u1ed9t r\u00e0ng bu\u1ed9c ki\u1ec3m tra tr\u00ean c\u1ed9t Chi\u1ebft kh\u1ea5u: (Chi\u1ebft kh\u1ea5u <= 100).<\/li>\n
              • Quy t\u1eafc kinh doanh:<\/strong> \u201cS\u1ed1 l\u01b0\u1ee3ng \u00e2m kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p trong kho.\u201d\n
              • R\u00e0ng bu\u1ed9c ERD:<\/strong> M\u1ed9t r\u00e0ng bu\u1ed9c ki\u1ec3m tra tr\u00ean c\u1ed9t S\u1ed1 l\u01b0\u1ee3ng: (S\u1ed1 l\u01b0\u1ee3ng >= 0).<\/li>\n<\/li>\n<\/li>\n<\/ul>\n

                M\u1eb7c d\u00f9 ki\u1ec3m tra \u1edf c\u1ea5p \u0111\u1ed9 \u1ee9ng d\u1ee5ng l\u00e0 ph\u1ed5 bi\u1ebfn, nh\u01b0ng ch\u1ec9 d\u1ef1a v\u00e0o n\u00f3 l\u00e0 r\u1ee7i ro. N\u1ebfu nhi\u1ec1u \u1ee9ng d\u1ee5ng truy c\u1eadp c\u00f9ng m\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u, ch\u00fang ph\u1ea3i \u0111\u1ec1u tri\u1ec3n khai c\u00f9ng m\u1ed9t logic. C\u00e1c r\u00e0ng bu\u1ed9c c\u01a1 s\u1edf d\u1eef li\u1ec7u cung c\u1ea5p m\u1ed9t ngu\u1ed3n th\u00f4ng tin duy nh\u1ea5t.<\/p>\n

                Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn trong vi\u1ec7c chuy\u1ec3n \u0111\u1ed5i \u26a0\ufe0f<\/h2>\n

                Ngay c\u1ea3 nh\u1eefng ng\u01b0\u1eddi m\u00f4 h\u00ecnh h\u00f3a c\u00f3 kinh nghi\u1ec7m c\u0169ng m\u1eafc sai l\u1ea7m khi chuy\u1ec3n \u0111\u1ed5i ng\u00f4n ng\u1eef kinh doanh th\u00e0nh s\u01a1 \u0111\u1ed3 k\u1ef9 thu\u1eadt. Nh\u1eadn th\u1ee9c v\u1ec1 nh\u1eefng b\u1eaby ph\u1ed5 bi\u1ebfn n\u00e0y gi\u00fap duy tr\u00ec \u0111\u1ed9 ch\u00ednh x\u00e1c.<\/p>\n

                  \n
                • S\u1ef1 m\u01a1 h\u1ed3 trong t\u1eeb \u201cph\u1ea3i\u201d:<\/strong>C\u00e1c b\u00ean li\u00ean quan kinh doanh th\u01b0\u1eddng d\u00f9ng \u201cn\u00ean\u201d ho\u1eb7c \u201cth\u01b0\u1eddng xuy\u00ean\u201d khi h\u1ecd mu\u1ed1n n\u00f3i \u0111\u1ebfn \u201cph\u1ea3i\u201d. Ng\u01b0\u1eddi m\u00f4 h\u00ecnh h\u00f3a ph\u1ea3i l\u00e0m r\u00f5 m\u1ed9t quy t\u1eafc l\u00e0 r\u00e0ng bu\u1ed9c c\u1ee9ng hay ch\u1ec9 l\u00e0 h\u01b0\u1edbng d\u1eabn. R\u00e0ng bu\u1ed9c c\u1ee9ng c\u1ea7n n\u1eb1m trong s\u01a1 \u0111\u1ed3; h\u01b0\u1edbng d\u1eabn th\u00ec n\u1eb1m trong logic \u1ee9ng d\u1ee5ng.<\/li>\n
                • B\u1ecf qua d\u1eef li\u1ec7u th\u1eddi gian:<\/strong> Nhi\u1ec1u quy t\u1eafc li\u00ean quan \u0111\u1ebfn th\u1eddi gian. \u201cM\u1ed9t \u0111\u01a1n h\u00e0ng ch\u1ec9 h\u1ee3p l\u1ec7 trong 24 gi\u1edd.\u201d \u0110i\u1ec1u n\u00e0y \u0111\u00f2i h\u1ecfi c\u00e1c r\u00e0ng bu\u1ed9c v\u1ec1 ng\u00e0y\/gi\u1edd v\u00e0 c\u00f3 th\u1ec3 c\u1ea3 logic h\u1ebft h\u1ea1n, m\u00e0 s\u01a1 \u0111\u1ed3 ERD ti\u00eau chu\u1ea9n th\u01b0\u1eddng kh\u00f4ng th\u1ec3 hi\u1ec7n r\u00f5 r\u00e0ng b\u1eb1ng h\u00ecnh \u1ea3nh.<\/li>\n
                • Qu\u00e1 chu\u1ea9n h\u00f3a:<\/strong> C\u1ed1 g\u1eafng \u00e1p d\u1ee5ng m\u1ecdi quy t\u1eafc kinh doanh \u1edf c\u1ea5p \u0111\u1ed9 c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u00f3 th\u1ec3 khi\u1ebfn s\u01a1 \u0111\u1ed3 tr\u1edf n\u00ean c\u1ee9ng nh\u1eafc v\u00e0 ch\u1eadm. Chu\u1ea9n h\u00f3a l\u00e0 thi\u1ebft y\u1ebfu \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n, nh\u01b0ng qu\u00e1 chu\u1ea9n h\u00f3a c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng hi\u1ec7u su\u1ea5t. C\u00e2n b\u1eb1ng l\u00e0 ch\u00eca kh\u00f3a.<\/li>\n
                • Gi\u1ea3 \u0111\u1ecbnh c\u00e1c quy t\u1eafc ng\u1ea7m:<\/strong> Ch\u1ec9 v\u00ec m\u1ed9t tr\u01b0\u1eddng t\u1ed3n t\u1ea1i kh\u00f4ng c\u00f3 ngh\u0129a l\u00e0 c\u00e1c quy t\u1eafc c\u1ee7a n\u00f3 \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh. V\u00ed d\u1ee5, n\u1ebfu tr\u01b0\u1eddng \u201cTr\u1ea1ng th\u00e1i\u201d t\u1ed3n t\u1ea1i, li\u1ec7u n\u00f3 c\u00f3 danh s\u00e1ch \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a c\u00e1c gi\u00e1 tr\u1ecb h\u1ee3p l\u1ec7 kh\u00f4ng? \u0110i\u1ec1u n\u00e0y n\u00ean l\u00e0 m\u1ed9t r\u00e0ng bu\u1ed9c li\u1ec7t k\u00ea ho\u1eb7c m\u1ed9t b\u1ea3ng tra c\u1ee9u.<\/li>\n<\/ul>\n

                  M\u1ed9t quy tr\u00ecnh th\u1ef1c t\u1ebf \u0111\u1ec3 \u00e1nh x\u1ea1 r\u00e0ng bu\u1ed9c \ud83d\udcdd<\/h2>\n

                  \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o kh\u00f4ng b\u1ecf s\u00f3t b\u1ea5t k\u1ef3 quy t\u1eafc n\u00e0o, h\u00e3y tu\u00e2n theo m\u1ed9t quy tr\u00ecnh c\u00f3 c\u1ea5u tr\u00fac. Quy tr\u00ecnh n\u00e0y di chuy\u1ec3n t\u1eeb c\u00e1c y\u00eau c\u1ea7u tr\u1eebu t\u01b0\u1ee3ng \u0111\u1ebfn c\u00e1c \u0111\u1ecbnh ngh\u0129a s\u01a1 \u0111\u1ed3 c\u1ee5 th\u1ec3.<\/p>\n

                    \n
                  1. Thu th\u1eadp y\u00eau c\u1ea7u:<\/strong> Ph\u1ecfng v\u1ea5n c\u00e1c b\u00ean li\u00ean quan. H\u1ecfi: \u201c\u0110i\u1ec1u g\u00ec ng\u0103n c\u1ea3n h\u00e0nh \u0111\u1ed9ng n\u00e0y?\u201d v\u00e0 \u201cD\u1eef li\u1ec7u n\u00e0o c\u1ea7n thi\u1ebft \u0111\u1ec3 ti\u1ebfp t\u1ee5c?\u201d<\/li>\n
                  2. T\u00e0i li\u1ec7u h\u00f3a c\u00e1c quy t\u1eafc:<\/strong> Li\u1ec7t k\u00ea m\u1ecdi quy t\u1eafc kinh doanh \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y. Nh\u00f3m ch\u00fang theo t\u1eebng Entiti.<\/li>\n
                  3. Thi\u1ebft k\u1ebf l\u01b0\u1ee3c \u0111\u1ed3:<\/strong>So\u1ea1n th\u1ea3o s\u01a1 \u0111\u1ed3 ERD ban \u0111\u1ea7u v\u1edbi c\u00e1c th\u1ef1c th\u1ec3 v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 c\u01a1 b\u1ea3n.<\/li>\n
                  4. \u00c1p d\u1ee5ng c\u00e1c r\u00e0ng bu\u1ed9c:<\/strong>Xem x\u00e9t danh s\u00e1ch quy t\u1eafc t\u1eebng c\u00e1i m\u1ed9t. G\u00e1n kh\u00f3a ch\u00ednh, kh\u00f3a ngo\u1ea1i, r\u00e0ng bu\u1ed9c Kh\u00f4ng r\u1ed7ng v\u00e0 r\u00e0ng bu\u1ed9c Ki\u1ec3m tra.<\/li>\n
                  5. Xem x\u00e9t c\u00e1c kho\u1ea3ng tr\u1ed1ng:<\/strong>T\u00ecm c\u00e1c th\u1ef1c th\u1ec3 ch\u01b0a c\u00f3 r\u00e0ng bu\u1ed9c n\u00e0o \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh. H\u1ecfi xem ch\u00fang c\u00f3 th\u1ef1c s\u1ef1 l\u00e0 t\u00f9y ch\u1ecdn hay kh\u00f4ng.<\/li>\n
                  6. X\u00e1c nh\u1eadn v\u1edbi c\u00e1c b\u00ean li\u00ean quan:<\/strong>Tr\u00ecnh b\u00e0y l\u1ea1i s\u01a1 \u0111\u1ed3 cho b\u1ed9 ph\u1eadn kinh doanh. H\u1ecfi: \u201cM\u00f4 h\u00ecnh n\u00e0y c\u00f3 ph\u1ea3n \u00e1nh \u0111\u00fang c\u00e1c quy t\u1eafc c\u1ee7a c\u00e1c b\u1ea1n kh\u00f4ng?\u201d<\/li>\n<\/ol>\n

                    So s\u00e1nh c\u00e1c lo\u1ea1i quy t\u1eafc v\u00e0 c\u00e1c c\u00e1ch tri\u1ec3n khai ERD \ud83d\udccb<\/h2>\n

                    B\u1ea3ng sau t\u00f3m t\u1eaft c\u00e1ch c\u00e1c lo\u1ea1i quy t\u1eafc kinh doanh kh\u00e1c nhau \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i th\u00e0nh c\u00e1c r\u00e0ng bu\u1ed9c k\u1ef9 thu\u1eadt.<\/p>\n\n\n\n\n\n\n\n\n\n\n
                    Lo\u1ea1i quy t\u1eafc kinh doanh<\/th>\nY\u00eau c\u1ea7u v\u00ed d\u1ee5<\/th>\nTri\u1ec3n khai ERD<\/th>\nLo\u1ea1i r\u00e0ng bu\u1ed9c<\/th>\n<\/tr>\n<\/thead>\n
                    T\u00ednh duy nh\u1ea5t<\/strong><\/td>\nC\u00e1c \u0111\u1ecba ch\u1ec9 email ph\u1ea3i duy nh\u1ea5t tr\u00ean to\u00e0n b\u1ed9 ng\u01b0\u1eddi d\u00f9ng.<\/td>\nCh\u1ec9 m\u1ee5c duy nh\u1ea5t tr\u00ean c\u1ed9t Email<\/td>\nR\u00e0ng bu\u1ed9c duy nh\u1ea5t<\/td>\n<\/tr>\n
                    T\u00ednh t\u1ed3n t\u1ea1i<\/strong><\/td>\nM\u1ed7i \u0111\u01a1n h\u00e0ng ph\u1ea3i thu\u1ed9c v\u1ec1 m\u1ed9t kh\u00e1ch h\u00e0ng.<\/td>\nKh\u00f3a ngo\u1ea1i t\u1eeb \u0110\u01a1n h\u00e0ng sang Kh\u00e1ch h\u00e0ng<\/td>\nTo\u00e0n v\u1eb9n tham chi\u1ebfu<\/td>\n<\/tr>\n
                    Ph\u1ea1m vi<\/strong><\/td>\nC\u00e1c gi\u00e1 tr\u1ecb \u0111o nhi\u1ec7t \u0111\u1ed9 ph\u1ea3i n\u1eb1m trong kho\u1ea3ng t\u1eeb -50 \u0111\u1ebfn 50.<\/td>\nR\u00e0ng bu\u1ed9c ki\u1ec3m tra tr\u00ean c\u1ed9t Nhi\u1ec7t \u0111\u1ed9<\/td>\nR\u00e0ng bu\u1ed9c Ki\u1ec3m tra<\/td>\n<\/tr>\n
                    B\u1eaft bu\u1ed9c<\/strong><\/td>\nT\u00ean s\u1ea3n ph\u1ea9m kh\u00f4ng \u0111\u01b0\u1ee3c \u0111\u1ec3 tr\u1ed1ng.<\/td>\nKh\u00f4ng r\u1ed7ng tr\u00ean c\u1ed9t T\u00ean<\/td>\nR\u00e0ng bu\u1ed9c kh\u1ea3 n\u0103ng r\u1ed7ng<\/td>\n<\/tr>\n
                    S\u1ed1 l\u01b0\u1ee3ng<\/strong><\/td>\nM\u1ed9t Qu\u1ea3n l\u00fd qu\u1ea3n l\u00fd nhi\u1ec1u Nh\u00e2n vi\u00ean.<\/td>\nKh\u00f3a ngo\u1ea1i tr\u00ean Nh\u00e2n vi\u00ean tham chi\u1ebfu \u0111\u1ebfn Qu\u1ea3n l\u00fd<\/td>\nM\u1ed1i quan h\u1ec7 M\u1ed9t-\u0110a<\/td>\n<\/tr>\n
                    S\u1ef1 ph\u1ee5 thu\u1ed9c logic<\/strong><\/td>\nNg\u00e0y thanh to\u00e1n ph\u1ea3i sau ng\u00e0y b\u1eaft \u0111\u1ea7u.<\/td>\nR\u00e0ng bu\u1ed9c ki\u1ec3m tra so s\u00e1nh c\u00e1c c\u1ed9t ng\u00e0y<\/td>\nR\u00e0ng bu\u1ed9c ki\u1ec3m tra<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                    T\u00e1c \u0111\u1ed9ng c\u1ee7a t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u \u0111\u1ebfn ho\u1ea1t \u0111\u1ed9ng kinh doanh \ud83d\udcc8<\/h2>\n

                    T\u1ea1i sao m\u1ee9c \u0111\u1ed9 chi ti\u1ebft n\u00e0y l\u1ea1i quan tr\u1ecdng? C\u00e2u tr\u1ea3 l\u1eddi n\u1eb1m \u1edf chi ph\u00ed c\u1ee7a d\u1eef li\u1ec7u k\u00e9m ch\u1ea5t l\u01b0\u1ee3ng. Khi c\u00e1c quy t\u1eafc kinh doanh kh\u00f4ng \u0111\u01b0\u1ee3c th\u1ef1c thi \u1edf c\u1ea5p \u0111\u1ed9 c\u01a1 s\u1edf d\u1eef li\u1ec7u, d\u1eef li\u1ec7u s\u1ebd b\u1ecb l\u1ec7ch. C\u00e1c b\u00e1o c\u00e1o tr\u1edf n\u00ean kh\u00f4ng ch\u00ednh x\u00e1c. S\u1ed1 l\u01b0\u1ee3ng t\u1ed3n kho b\u1ecb sai. Ki\u1ec3m to\u00e1n t\u00e0i ch\u00ednh th\u1ea5t b\u1ea1i. Vi\u1ec7c s\u1eeda ch\u1eefa d\u1eef li\u1ec7u sau khi l\u01b0u tr\u1eef t\u1ed1n k\u00e9m h\u01a1n nhi\u1ec1u so v\u1edbi vi\u1ec7c ng\u0103n ng\u1eeba n\u00f3 trong qu\u00e1 tr\u00ecnh m\u00f4 h\u00ecnh h\u00f3a.<\/p>\n

                    H\u01a1n n\u1eefa, c\u00e1c r\u00e0ng bu\u1ed9c ch\u00ednh x\u00e1c gi\u00fap gi\u1ea3m g\u00e1nh n\u1eb7ng cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n \u1ee9ng d\u1ee5ng. Khi c\u01a1 s\u1edf d\u1eef li\u1ec7u th\u1ef1c thi c\u00e1c quy t\u1eafc, m\u00e3 \u1ee9ng d\u1ee5ng tr\u1edf n\u00ean \u0111\u01a1n gi\u1ea3n h\u01a1n. N\u00f3 kh\u00f4ng c\u1ea7n ph\u1ea3i x\u00e1c minh t\u1eebng tr\u01b0\u1eddng \u0111\u1ea7u v\u00e0o m\u1ed9t c\u00e1ch th\u1ee7 c\u00f4ng. N\u00f3 c\u00f3 th\u1ec3 tin t\u01b0\u1edfng v\u00e0o c\u1ea5u tr\u00fac d\u1eef li\u1ec7u. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn chu k\u1ef3 ph\u00e1t tri\u1ec3n nhanh h\u01a1n v\u00e0 \u00edt l\u1ed7i h\u01a1n trong m\u00f4i tr\u01b0\u1eddng s\u1ea3n xu\u1ea5t.<\/p>\n

                    H\u01a1n n\u1eefa, m\u1ed9t s\u01a1 \u0111\u1ed3 ERD \u0111\u01b0\u1ee3c r\u00e0ng bu\u1ed9c t\u1ed1t \u0111\u00f3ng vai tr\u00f2 nh\u01b0 t\u00e0i li\u1ec7u. C\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n m\u1edbi c\u00f3 th\u1ec3 xem s\u01a1 \u0111\u1ed3 v\u00e0 hi\u1ec3u logic kinh doanh m\u00e0 kh\u00f4ng c\u1ea7n \u0111\u1ecdc qua h\u00e0ng lo\u1ea1t t\u00e0i li\u1ec7u y\u00eau c\u1ea7u. C\u1ea5u tr\u00fac d\u1eef li\u1ec7u tr\u1edf th\u00e0nh t\u00e0i li\u1ec7u s\u1ed1ng \u0111\u1ed9ng cho c\u00e1c quy t\u1eafc kinh doanh.<\/p>\n

                    Nh\u1eefng c\u00e2n nh\u1eafc cu\u1ed1i c\u00f9ng cho ng\u01b0\u1eddi m\u00f4 h\u00ecnh h\u00f3a \ud83e\udde0<\/h2>\n

                    Vi\u1ec7c chuy\u1ec3n \u0111\u1ed5i c\u00e1c quy t\u1eafc kinh doanh kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t c\u00f4ng vi\u1ec7c m\u1ed9t l\u1ea7n. Khi doanh nghi\u1ec7p ph\u00e1t tri\u1ec3n, c\u00e1c quy t\u1eafc thay \u0111\u1ed5i. M\u1ed9t quy \u0111\u1ecbnh m\u1edbi c\u00f3 th\u1ec3 y\u00eau c\u1ea7u m\u1ed9t tr\u01b0\u1eddng ph\u1ea3i b\u1eaft bu\u1ed9c. M\u1ed9t quy tr\u00ecnh m\u1edbi c\u00f3 th\u1ec3 cho ph\u00e9p kh\u00e1ch h\u00e0ng c\u00f3 nhi\u1ec1u s\u1ed1 \u0111i\u1ec7n tho\u1ea1i. S\u01a1 \u0111\u1ed3 ERD ph\u1ea3i \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd phi\u00ean b\u1ea3n v\u00e0 c\u1eadp nh\u1eadt t\u01b0\u01a1ng \u1ee9ng.<\/p>\n

                    Lu\u00f4n \u01b0u ti\u00ean s\u1ef1 r\u00f5 r\u00e0ng h\u01a1n l\u00e0 \u0111\u1ed9 ph\u1ee9c t\u1ea1p. N\u1ebfu m\u1ed9t r\u00e0ng bu\u1ed9c qu\u00e1 kh\u00f3 gi\u1ea3i th\u00edch v\u1edbi ng\u01b0\u1eddi li\u00ean quan kinh doanh, c\u00f3 th\u1ec3 n\u00f3 qu\u00e1 ph\u1ee9c t\u1ea1p \u0111\u1ec3 h\u1ec7 th\u1ed1ng x\u1eed l\u00fd hi\u1ec7u qu\u1ea3. H\u00e3y n\u1ed7 l\u1ef1c x\u00e2y d\u1ef1ng m\u1ed9t m\u00f4 h\u00ecnh v\u1eeba \u0111\u1ee7 nghi\u00eam ng\u1eb7t \u0111\u1ec3 b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u, v\u1eeba \u0111\u1ee7 linh ho\u1ea1t \u0111\u1ec3 h\u1ed7 tr\u1ee3 s\u1ef1 ph\u00e1t tri\u1ec3n trong t\u01b0\u01a1ng lai.<\/p>\n

                    B\u1eb1ng c\u00e1ch coi c\u00e1c quy t\u1eafc kinh doanh l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a m\u00f4 h\u00ecnh d\u1eef li\u1ec7u, b\u1ea1n \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng h\u1ed7 tr\u1ee3 t\u1ed5 ch\u1ee9c m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c. S\u1ef1 \u0111\u1ed3ng b\u1ed9 gi\u1eefa logic v\u00e0 c\u1ea5u tr\u00fac l\u00e0 d\u1ea5u \u1ea5n c\u1ee7a ki\u1ebfn tr\u00fac d\u1eef li\u1ec7u chuy\u00ean nghi\u1ec7p. \u0110i\u1ec1u n\u00e0y bi\u1ebfn m\u1ed9t t\u1eadp h\u1ee3p \u0111\u01a1n gi\u1ea3n c\u00e1c b\u1ea3ng th\u00e0nh m\u1ed9t \u0111\u1ed9ng c\u01a1 \u0111\u00e1ng tin c\u1eady cho ho\u1ea1t \u0111\u1ed9ng kinh doanh.<\/p>\n","protected":false},"excerpt":{"rendered":"

                    X\u00e2y d\u1ef1ng m\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u m\u1ea1nh m\u1ebd b\u1eaft \u0111\u1ea7u t\u1eeb r\u1ea5t l\u00e2u tr\u01b0\u1edbc khi d\u00f2ng m\u00e3 \u0111\u1ea7u ti\u00ean \u0111\u01b0\u1ee3c vi\u1ebft ra. N\u00f3 b\u1eaft \u0111\u1ea7u b\u1eb1ng vi\u1ec7c hi\u1ec3u logic…<\/p>\n","protected":false},"author":1,"featured_media":1521,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"Chuy\u1ec3n \u0111\u1ed5i c\u00e1c quy t\u1eafc kinh doanh th\u00e0nh c\u00e1c r\u00e0ng bu\u1ed9c ERD \ud83d\uddc4\ufe0f","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1ch chuy\u1ec3n \u0111\u1ed5i c\u00e1c y\u00eau c\u1ea7u kinh doanh th\u00e0nh c\u00e1c r\u00e0ng bu\u1ed9c s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 ch\u00ednh x\u00e1c. \u0110\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a m\u00f4 h\u00ecnh. \ud83d\udcca","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[65],"tags":[80,84],"class_list":["post-1520","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-database-design","tag-academic","tag-erd"],"yoast_head":"\nChuy\u1ec3n \u0111\u1ed5i c\u00e1c quy t\u1eafc kinh doanh th\u00e0nh c\u00e1c r\u00e0ng bu\u1ed9c ERD \ud83d\uddc4\ufe0f<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1ch chuy\u1ec3n \u0111\u1ed5i c\u00e1c y\u00eau c\u1ea7u kinh doanh th\u00e0nh c\u00e1c r\u00e0ng bu\u1ed9c s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 ch\u00ednh x\u00e1c. \u0110\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a m\u00f4 h\u00ecnh. \ud83d\udcca\" \/>\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.ez-knowledge.com\/vi\/translating-business-rules-erd-constraints\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chuy\u1ec3n \u0111\u1ed5i c\u00e1c quy t\u1eafc kinh doanh th\u00e0nh c\u00e1c r\u00e0ng bu\u1ed9c ERD \ud83d\uddc4\ufe0f\" \/>\n<meta property=\"og:description\" content=\"H\u1ecdc c\u00e1ch chuy\u1ec3n \u0111\u1ed5i c\u00e1c y\u00eau c\u1ea7u kinh doanh th\u00e0nh c\u00e1c r\u00e0ng bu\u1ed9c s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 ch\u00ednh x\u00e1c. \u0110\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a m\u00f4 h\u00ecnh. \ud83d\udcca\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ez-knowledge.com\/vi\/translating-business-rules-erd-constraints\/\" \/>\n<meta property=\"og:site_name\" content=\"Ez Knowledge Vietnamese - 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