{"id":1730,"date":"2026-04-01T15:24:08","date_gmt":"2026-04-01T15:24:08","guid":{"rendered":"https:\/\/www.viz-read.com\/vn\/common-mistakes-object-diagrams-students\/"},"modified":"2026-04-01T15:24:08","modified_gmt":"2026-04-01T15:24:08","slug":"common-mistakes-object-diagrams-students","status":"publish","type":"post","link":"https:\/\/www.viz-read.com\/vn\/common-mistakes-object-diagrams-students\/","title":{"rendered":"Nh\u1eefng Sai l\u1ea7m Ph\u1ed5 bi\u1ebfn trong Bi\u1ec3u \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng m\u00e0 M\u1ecdi Sinh vi\u00ean C\u1ea7n Tr\u00e1nh"},"content":{"rendered":"

Bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 m\u1ed9t th\u00e0nh ph\u1ea7n quan tr\u1ecdng trong t\u00e0i li\u1ec7u Ng\u00f4n ng\u1eef M\u00f4 h\u00ecnh h\u00f3a Th\u1ed1ng nh\u1ea5t (UML). Ch\u00fang cung c\u1ea5p m\u1ed9t b\u1ee9c \u1ea3nh t\u0129nh c\u1ee7a h\u1ec7 th\u1ed1ng t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3. Kh\u00e1c v\u1edbi bi\u1ec3u \u0111\u1ed3 l\u1edbp, v\u1ed1n \u0111\u1ecbnh ngh\u0129a b\u1ea3n thi\u1ebft k\u1ebf, bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng m\u00f4 t\u1ea3 c\u00e1c th\u1ec3 hi\u1ec7n th\u1ef1c t\u1ebf. Nhi\u1ec1u sinh vi\u00ean g\u1eb7p kh\u00f3 kh\u0103n trong vi\u1ec7c ph\u00e2n bi\u1ec7t gi\u1eefa c\u1ea5u tr\u00fac l\u00fd thuy\u1ebft v\u00e0 c\u00e1ch tri\u1ec3n khai th\u1ef1c t\u1ebf. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng d\u1eabn \u0111\u1ebfn c\u00e1c bi\u1ec3u \u0111\u1ed3 g\u00e2y nh\u1ea7m l\u1eabn, kh\u00f4ng ch\u00ednh x\u00e1c ho\u1eb7c g\u00e2y hi\u1ec3u l\u1ea7m. Vi\u1ec7c hi\u1ec3u r\u00f5 c\u00e1c l\u1ed7i ph\u1ed5 bi\u1ebfn l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 t\u1ea1o ra c\u00e1c m\u00f4 h\u00ecnh h\u1ec7 th\u1ed1ng r\u00f5 r\u00e0ng. H\u01b0\u1edbng d\u1eabn n\u00e0y n\u00eau ra nh\u1eefng c\u00e1i b\u1eaby th\u01b0\u1eddng g\u1eb7p v\u00e0 \u0111\u01b0a ra c\u00e1c bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c d\u1ef1a tr\u00ean c\u00e1c quy \u01b0\u1edbc m\u00f4 h\u00ecnh h\u00f3a ti\u00eau chu\u1ea9n.<\/p>\n

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\"Charcoal<\/figure>\n<\/div>\n

1. Nh\u1ea7m l\u1eabn gi\u1eefa \u0110\u1ecbnh ngh\u0129a L\u1edbp v\u00e0 Th\u1ec3 hi\u1ec7n \ud83e\udde0<\/h2>\n

L\u1ed7i c\u01a1 b\u1ea3n nh\u1ea5t x\u1ea3y ra khi sinh vi\u00ean x\u1eed l\u00fd bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng gi\u1ed1ng h\u1ec7t nh\u01b0 bi\u1ec3u \u0111\u1ed3 l\u1edbp. M\u1ed9t bi\u1ec3u \u0111\u1ed3 l\u1edbp \u0111\u1ecbnh ngh\u0129a c\u00e1c lo\u1ea1i, thu\u1ed9c t\u00ednh v\u00e0 c\u00e1c ph\u00e9p to\u00e1n. M\u1ed9t bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ecbnh ngh\u0129a c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee5 th\u1ec3 c\u1ee7a c\u00e1c lo\u1ea1i \u0111\u00f3. N\u1ebfu b\u1ea1n v\u1ebd m\u1ed9t h\u1ed9p l\u1edbp, b\u1ea1n \u0111ang \u0111\u1ecbnh ngh\u0129a m\u1ed9t lo\u1ea1i. N\u1ebfu b\u1ea1n v\u1ebd m\u1ed9t h\u1ed9p \u0111\u1ed1i t\u01b0\u1ee3ng, b\u1ea1n \u0111ang \u0111\u1ecbnh ngh\u0129a m\u1ed9t th\u1ef1c th\u1ec3 c\u1ee5 th\u1ec3. Vi\u1ec7c tr\u1ed9n l\u1eabn hai kh\u00e1i ni\u1ec7m n\u00e0y t\u1ea1o ra s\u1ef1 m\u01a1 h\u1ed3 v\u1ec1 vi\u1ec7c b\u1ea1n \u0111ang m\u00f4 t\u1ea3 ti\u1ec1m n\u0103ng hay th\u1ef1c t\u1ebf.<\/p>\n

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  • L\u1ed7i:<\/strong> G\u00e1n nh\u00e3n cho m\u1ed9t h\u1ed9p \u0111\u1ed1i t\u01b0\u1ee3ng ch\u1ec9 b\u1eb1ng t\u00ean lo\u1ea1i m\u00e0 kh\u00f4ng c\u00f3 \u0111\u1ecbnh danh th\u1ec3 hi\u1ec7n.<\/li>\n
  • C\u00e1ch kh\u1eafc ph\u1ee5c:<\/strong> M\u1ecdi \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ec1u ph\u1ea3i c\u00f3 m\u1ed9t \u0111\u1ecbnh danh duy nh\u1ea5t, th\u01b0\u1eddng \u0111\u01b0\u1ee3c vi\u1ebft d\u01b0\u1edbi d\u1ea1ng tenTheHien : TenLop<\/em>.<\/li>\n
  • T\u00e1c \u0111\u1ed9ng:<\/strong> N\u1ebfu kh\u00f4ng c\u00f3 s\u1ef1 ph\u00e2n bi\u1ec7t r\u00f5 r\u00e0ng, ng\u01b0\u1eddi xem kh\u00f4ng th\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c bi\u1ec3u \u0111\u1ed3 \u0111\u1ea1i di\u1ec7n cho m\u1ed9t c\u1ea5u h\u00ecnh \u0111\u01a1n l\u1ebb hay c\u1ea5u tr\u00fac t\u1ed5ng qu\u00e1t c\u1ee7a ph\u1ea7n m\u1ec1m.<\/li>\n<\/ul>\n

    Khi t\u1ea1o m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng, b\u1ea1n \u0111ang th\u1ec3 hi\u1ec7n m\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3 trong v\u00f2ng \u0111\u1eddi c\u1ee7a h\u1ec7 th\u1ed1ng. V\u00ed d\u1ee5, n\u1ebfu b\u1ea1n c\u00f3 m\u1ed9t l\u1edbp NguoiDung<\/code>, bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng n\u00ean hi\u1ec3n th\u1ecb nguoiDung1 : NguoiDung<\/code>, ch\u1ee9 kh\u00f4ng ch\u1ec9 l\u00e0 NguoiDung<\/code>. S\u1ef1 ph\u00e2n bi\u1ec7t n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u00f4 h\u00ecnh ph\u1ea3n \u00e1nh th\u1ef1c t\u1ebf thay v\u00ec l\u00fd thuy\u1ebft.<\/p>\n

    2. Quy \u01b0\u1edbc \u0110\u1eb7t t\u00ean Th\u1ec3 hi\u1ec7n Kh\u00f4ng ch\u00ednh x\u00e1c \ud83c\udff7\ufe0f<\/h2>\n

    Vi\u1ec7c \u0111\u1eb7t t\u00ean cho c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 g\u1eafn nh\u00e3n; \u0111\u00f3 l\u00e0 v\u1ec1 vi\u1ec7c x\u00e1c \u0111\u1ecbnh. Trong nhi\u1ec1u ti\u00eau chu\u1ea9n m\u00f4 h\u00ecnh h\u00f3a, t\u00ean \u0111\u1ed1i t\u01b0\u1ee3ng bao g\u1ed3m m\u1ed9t t\u00ean th\u1ec3 hi\u1ec7n t\u00f9y ch\u1ecdn, theo sau l\u00e0 d\u1ea5u hai ch\u1ea5m v\u00e0 t\u00ean l\u1edbp. Sinh vi\u00ean th\u01b0\u1eddng b\u1ecf ho\u00e0n to\u00e0n t\u00ean th\u1ec3 hi\u1ec7n, d\u1eabn \u0111\u1ebfn c\u00e1c nh\u00e3n chung chung nh\u01b0 KhachHang<\/code> thay v\u00ec khachHang01 : KhachHang<\/code>.<\/p>\n

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    • L\u1ed7i:<\/strong> Ch\u1ec9 s\u1eed d\u1ee5ng t\u00ean l\u1edbp cho nh\u00e3n \u0111\u1ed1i t\u01b0\u1ee3ng.<\/li>\n
    • C\u00e1ch kh\u1eafc ph\u1ee5c:<\/strong> Lu\u00f4n \u0111\u1eb7t m\u1ed9t \u0111\u1ecbnh danh duy nh\u1ea5t l\u00e0m ti\u1ec1n t\u1ed1 cho t\u00ean l\u1edbp n\u1ebfu t\u1ed3n t\u1ea1i nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a c\u00f9ng m\u1ed9t l\u1edbp.<\/li>\n
    • T\u00e1c \u0111\u1ed9ng:<\/strong>Vi\u1ec7c theo d\u00f5i c\u00e1c lu\u1ed3ng d\u1eef li\u1ec7u c\u1ee5 th\u1ec3 ho\u1eb7c theo d\u00f5i c\u00e1c thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i cho t\u1eebng th\u1ef1c th\u1ec3 ri\u00eang l\u1ebb tr\u1edf n\u00ean kh\u00f4ng th\u1ec3.<\/li>\n<\/ul>\n

      H\u00e3y xem x\u00e9t m\u1ed9t t\u00ecnh hu\u1ed1ng trong \u0111\u00f3 b\u1ea1n c\u00f3 nhi\u1ec1u t\u00e0i kho\u1ea3n ng\u00e2n h\u00e0ng. N\u1ebfu b\u1ea1n \u0111\u1eb7t t\u00ean cho c\u1ea3 hai ch\u1ec9 \u0111\u01a1n gi\u1ea3n l\u00e0 “T\u00e0i kho\u1ea3n\"<\/code>“, b\u1ea1n s\u1ebd kh\u00f4ng th\u1ec3 ph\u00e2n bi\u1ec7t gi\u1eefa “T\u00e0i kho\u1ea3n1\"<\/code> v\u00e0 “T\u00e0i kho\u1ea3n2\"<\/code>” trong ph\u00e2n t\u00edch c\u1ee7a b\u1ea1n. Vi\u1ec7c \u0111\u1eb7t t\u00ean nh\u1ea5t qu\u00e1n cho ph\u00e9p tham chi\u1ebfu ch\u00ednh x\u00e1c trong c\u00e1c t\u00e0i li\u1ec7u ho\u1eb7c qu\u00e1 tr\u00ecnh t\u1ea1o m\u00e3 sau \u0111\u00f3.<\/p>\n

      3. Hi\u1ec3u sai v\u1ec1 B\u1ed9i s\u1ed1 v\u00e0 S\u1ed1 l\u01b0\u1ee3ng \ud83d\udd22<\/h2>\n

      B\u1ed9i s\u1ed1 x\u00e1c \u0111\u1ecbnh c\u00f3 bao nhi\u00eau th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t l\u1edbp li\u00ean quan \u0111\u1ebfn m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a l\u1edbp kh\u00e1c. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n d\u01b0\u1edbi d\u1ea1ng m\u1ed9t kho\u1ea3ng, ch\u1eb3ng h\u1ea1n nh\u01b0 “0..1<\/code>, 1<\/code>“, ho\u1eb7c “0..*<\/code>“. Sinh vi\u00ean th\u01b0\u1eddng \u0111\u1eb7t sai v\u1ecb tr\u00ed c\u00e1c con s\u1ed1 n\u00e0y ho\u1eb7c \u00e1p d\u1ee5ng ch\u00fang kh\u00f4ng ch\u00ednh x\u00e1c v\u00e0o c\u00e1c bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng, trong khi ch\u00fang thu\u1ed9c v\u1ec1 c\u00e1c bi\u1ec3u \u0111\u1ed3 l\u1edbp.<\/p>\n

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      • L\u1ed7i:<\/strong>V\u1ebd c\u00e1c m\u1ed1i quan h\u1ec7 m\u00e0 kh\u00f4ng c\u00f3 ch\u1ec9 b\u00e1o b\u1ed9i s\u1ed1 ho\u1eb7c s\u1eed d\u1ee5ng b\u1ed9i s\u1ed1 \u1edf m\u1ee9c l\u1edbp cho c\u00e1c li\u00ean k\u1ebft \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee5 th\u1ec3.<\/li>\n
      • C\u00e1ch kh\u1eafc ph\u1ee5c:<\/strong>\u0110\u1ea3m b\u1ea3o r\u1eb1ng bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng ph\u1ea3n \u00e1nh c\u00e1c r\u00e0ng bu\u1ed9c \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong bi\u1ec3u \u0111\u1ed3 l\u1edbp. N\u1ebfu bi\u1ec3u \u0111\u1ed3 l\u1edbp ghi “1<\/code>“, li\u00ean k\u1ebft \u0111\u1ed1i t\u01b0\u1ee3ng ph\u1ea3i th\u1ec3 hi\u1ec7n r\u1eb1ng m\u1ed9t m\u1ed1i quan h\u1ec7 c\u1ee5 th\u1ec3 t\u1ed3n t\u1ea1i.<\/li>\n
      • T\u00e1c \u0111\u1ed9ng:<\/strong>S\u1ef1 kh\u00f4ng r\u00f5 r\u00e0ng v\u1ec1 t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u v\u00e0 c\u00e1c r\u00e0ng bu\u1ed9c c\u1ee7a m\u1ed1i quan h\u1ec7.<\/li>\n<\/ul>\n

        B\u1ed9i s\u1ed1 l\u00e0 m\u1ed9t r\u00e0ng bu\u1ed9c \u0111\u1ed1i v\u1edbi m\u1ed1i quan h\u1ec7. N\u1ebfu m\u1ed9t “Qu\u1ea3n l\u00fd\"<\/code> l\u1edbp c\u00f3 m\u1ed1i quan h\u1ec7 v\u1edbi “Nh\u00e2n vi\u00ean\"<\/code>” \u0111\u01b0\u1ee3c \u0111\u00e1nh d\u1ea5u l\u00e0 “1<\/code>, m\u1ed9t bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng hi\u1ec3n th\u1ecb manager1<\/code> \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi employee1<\/code> v\u00e0 employee2<\/code> vi ph\u1ea1m r\u00e0ng bu\u1ed9c \u0111\u00f3 tr\u1eeb khi t\u00ednh \u0111a tr\u1ecb cho ph\u00e9p nhi\u1ec1u nh\u00e2n vi\u00ean. Sinh vi\u00ean th\u01b0\u1eddng b\u1ecf qua c\u00e1c r\u00e0ng bu\u1ed9c s\u1ed1 h\u1ecdc \u1edf hai \u0111\u1ea7u c\u1ee7a c\u00e1c \u0111\u01b0\u1eddng li\u00ean k\u1ebft.<\/p>\n

        4. B\u1ecf qua t\u00ednh \u0111\u1ecbnh h\u01b0\u1edbng v\u00e0 kh\u1ea3 n\u0103ng \u0111i\u1ec1u h\u01b0\u1edbng c\u1ee7a li\u00ean k\u1ebft \u27a1\ufe0f<\/h2>\n

        C\u00e1c m\u1ed1i quan h\u1ec7 trong bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng hai chi\u1ec1u. Kh\u1ea3 n\u0103ng \u0111i\u1ec1u h\u01b0\u1edbng ch\u1ec9 ra h\u01b0\u1edbng n\u00e0o m\u00e0 m\u1ed1i quan h\u1ec7 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c duy\u1ec7t qua. M\u1ed9t sinh vi\u00ean c\u00f3 th\u1ec3 v\u1ebd m\u1ed9t \u0111\u01b0\u1eddng gi\u1eefa hai \u0111\u1ed1i t\u01b0\u1ee3ng nh\u01b0ng l\u1ea1i kh\u00f4ng ch\u1ec9 ra \u0111\u1ea7u n\u00e0o kh\u1edfi t\u1ea1o k\u1ebft n\u1ed1i.<\/p>\n

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        • L\u1ed7i:<\/strong> V\u1ebd c\u00e1c \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u01a1n gi\u1ea3n kh\u00f4ng c\u00f3 \u0111\u1ea7u m\u0169i t\u00ean tr\u00ean c\u00e1c li\u00ean k\u1ebft li\u00ean k\u1ebft.<\/li>\n
        • C\u00e1ch s\u1eeda:<\/strong> S\u1eed d\u1ee5ng c\u00e1c \u0111\u1ea7u m\u0169i t\u00ean m\u1edf \u0111\u1ec3 th\u1ec3 hi\u1ec7n kh\u1ea3 n\u0103ng \u0111i\u1ec1u h\u01b0\u1edbng. N\u1ebfu \u0110\u1ed1i t\u01b0\u1ee3ng A<\/code> bi\u1ebft v\u1ec1 \u0110\u1ed1i t\u01b0\u1ee3ng B<\/code>, m\u0169i t\u00ean s\u1ebd ch\u1ec9 t\u1eeb A \u0111\u1ebfn B.<\/li>\n
        • T\u00e1c \u0111\u1ed9ng:<\/strong> Ng\u01b0\u1eddi xem kh\u00f4ng th\u1ec3 x\u00e1c \u0111\u1ecbnh d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy c\u1eadp nh\u01b0 th\u1ebf n\u00e0o ho\u1eb7c c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng t\u00ecm th\u1ea5y nhau trong b\u1ed9 nh\u1edb ra sao.<\/li>\n<\/ul>\n

          Trong m\u1ed9t h\u1ec7 th\u1ed1ng n\u01a1i m\u1ed9t \u0110\u01a1n h\u00e0ng<\/code> tham chi\u1ebfu \u0111\u1ebfn m\u1ed9t Kh\u00e1ch h\u00e0ng.<\/code>, \u0111\u01a1n h\u00e0ng s\u1ebd gi\u1eef tham chi\u1ebfu. M\u0169i t\u00ean n\u00ean ch\u1ec9 t\u1eeb \u0110\u01a1n h\u00e0ng<\/code> \u0111\u1ebfn Kh\u00e1ch h\u00e0ng.<\/code> \u0110i\u1ec1u n\u00e0y cho th\u1ea5y \u0111\u1ec3 t\u00ecm kh\u00e1ch h\u00e0ng, b\u1ea1n b\u1eaft \u0111\u1ea7u t\u1eeb \u0111\u01a1n h\u00e0ng. \u0110\u1ea3o ng\u01b0\u1ee3c \u0111i\u1ec1u n\u00e0y ng\u1ee5 \u00fd r\u1eb1ng kh\u00e1ch h\u00e0ng gi\u1eef tham chi\u1ebfu \u0111\u1ebfn \u0111\u01a1n h\u00e0ng, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t l\u1ed7i logic trong thi\u1ebft k\u1ebf.<\/p>\n

          5. Nh\u1ea7m l\u1eabn gi\u1eefa T\u1eadp h\u1ee3p v\u00e0 T\u1ed5ng h\u1ee3p \ud83e\udde9<\/h2>\n

          M\u1ed1i quan h\u1ec7 t\u1ed5ng h\u1ee3p x\u00e1c \u0111\u1ecbnh m\u1ed9t li\u00ean k\u1ebft ‘m\u1ed9t ph\u1ea7n c\u1ee7a’ m\u1ea1nh m\u1ebd, n\u01a1i v\u00f2ng \u0111\u1eddi c\u1ee7a ph\u1ea7n ph\u1ee5 thu\u1ed9c v\u00e0o to\u00e0n b\u1ed9. T\u1eadp h\u1ee3p ng\u1ee5 \u00fd m\u1ed9t m\u1ed1i quan h\u1ec7 y\u1ebfu h\u01a1n, n\u01a1i c\u00e1c ph\u1ea7n c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp. Sinh vi\u00ean th\u01b0\u1eddng s\u1eed d\u1ee5ng c\u00f9ng m\u1ed9t ki\u1ec3u \u0111\u01b0\u1eddng cho c\u1ea3 hai, ho\u1eb7c s\u1eed d\u1ee5ng ch\u00fang thay th\u1ebf cho nhau.<\/p>\n

            \n
          • L\u1ed7i:<\/strong>Xem m\u1ecdi m\u1ed1i quan h\u1ec7 ch\u1ee9a nh\u01b0 l\u00e0 c\u00e1c li\u00ean k\u1ebft \u0111\u01a1n gi\u1ea3n.<\/li>\n
          • C\u00e1ch s\u1eeda:<\/strong>S\u1eed d\u1ee5ng h\u00ecnh thoi \u0111\u1ea7y m\u00e0u cho Quan h\u1ec7 h\u1ee3p th\u00e0nh (Composition) v\u00e0 h\u00ecnh thoi r\u1ed7ng cho Quan h\u1ec7 t\u1eadp h\u1ee3p (Aggregation).<\/li>\n
          • T\u00e1c \u0111\u1ed9ng:<\/strong>Hi\u1ec3u sai v\u1ec1 qu\u1ea3n l\u00fd v\u00f2ng \u0111\u1eddi \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 c\u1ea5p ph\u00e1t b\u1ed9 nh\u1edb.<\/li>\n<\/ul>\n

            N\u1ebfu m\u1ed9t Xe \u00f4 t\u00f4<\/code> ch\u1ee9a m\u1ed9t \u0110\u1ed9ng c\u01a1<\/code>, \u0111\u1ed9ng c\u01a1 th\u01b0\u1eddng kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i n\u1ebfu kh\u00f4ng c\u00f3 xe trong ng\u1eef c\u1ea3nh n\u00e0y (H\u1ee3p th\u00e0nh). N\u1ebfu m\u1ed9t Ph\u00f2ng ban<\/code> ch\u1ee9a Nh\u00e2n vi\u00ean<\/code>, nh\u00e2n vi\u00ean v\u1eabn c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i ngay c\u1ea3 khi ph\u00f2ng ban gi\u1ea3i th\u1ec3 (T\u1eadp h\u1ee3p). Vi\u1ec7c nh\u1ea7m l\u1eabn hai kh\u00e1i ni\u1ec7m n\u00e0y cho th\u1ea5y c\u00e1c quy\u1ebft \u0111\u1ecbnh ki\u1ebfn tr\u00fac sai l\u1ea7m v\u1ec1 quy\u1ec1n s\u1edf h\u1eefu t\u00e0i nguy\u00ean.<\/p>\n

            6. B\u1ecf qua gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh cho c\u00e1c th\u1ec3 hi\u1ec7n \ud83d\udcdd<\/h2>\n

            M\u1ed9t trong nh\u1eefng m\u1ee5c \u0111\u00edch ch\u00ednh c\u1ee7a bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 th\u1ec3 hi\u1ec7n tr\u1ea1ng th\u00e1i. Bi\u1ec3u \u0111\u1ed3 l\u1edbp \u0111\u1ecbnh ngh\u0129a nh\u1eefng thu\u1ed9c t\u00ednh n\u00e0o t\u1ed3n t\u1ea1i. Bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng n\u00ean th\u1ec3 hi\u1ec7n c\u00e1c gi\u00e1 tr\u1ecb m\u00e0 nh\u1eefng thu\u1ed9c t\u00ednh \u0111\u00f3 \u0111ang gi\u1eef t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3. Sinh vi\u00ean th\u01b0\u1eddng v\u1ebd h\u1ed9p \u0111\u1ed1i t\u01b0\u1ee3ng nh\u01b0ng \u0111\u1ec3 tr\u1ed1ng ph\u1ea7n thu\u1ed9c t\u00ednh.<\/p>\n

              \n
            • L\u1ed7i:<\/strong>Th\u1ec3 hi\u1ec7n h\u00ecnh d\u1ea1ng \u0111\u1ed1i t\u01b0\u1ee3ng nh\u01b0ng kh\u00f4ng c\u00f3 d\u1eef li\u1ec7u b\u00ean trong ph\u1ea7n thu\u1ed9c t\u00ednh.<\/li>\n
            • C\u00e1ch s\u1eeda:<\/strong> \u0110i\u1ec1n v\u00e0o ph\u1ea7n thu\u1ed9c t\u00ednh b\u1eb1ng c\u00e1c gi\u00e1 tr\u1ecb hi\u1ec7n t\u1ea1i (v\u00ed d\u1ee5: tr\u1ea1ng th\u00e1i: \u0111ang ho\u1ea1t \u0111\u1ed9ng<\/code>).<\/li>\n
            • T\u00e1c \u0111\u1ed9ng:<\/strong>Bi\u1ec3u \u0111\u1ed3 m\u1ea5t \u0111i gi\u00e1 tr\u1ecb c\u1ee7a n\u00f3 nh\u01b0 m\u1ed9t tr\u01b0\u1eddng h\u1ee3p ki\u1ec3m th\u1eed ho\u1eb7c m\u1ed9t b\u1ea3n ch\u1ee5p g\u1ee1 l\u1ed7i.<\/li>\n<\/ul>\n

              H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng \u0111ang g\u1ee1 l\u1ed7i m\u1ed9t s\u1ef1 c\u1ed1 h\u1ec7 th\u1ed1ng. Bi\u1ec3u \u0111\u1ed3 l\u1edbp cho b\u1ea1n bi\u1ebft c\u1ea5u tr\u00fac. Bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng cho b\u1ea1n bi\u1ebft tr\u1ea1ng th\u00e1i. N\u1ebfu b\u1ea1n c\u00f3 m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng transaction1 : Giao d\u1ecbch<\/code>, b\u1ea1n n\u00ean th\u1ea5y s\u1ed1 ti\u1ec1n: 100.00<\/code> v\u00e0 ng\u00e0y: 2023-10-01<\/code>. N\u1ebfu kh\u00f4ng c\u00f3 c\u00e1c gi\u00e1 tr\u1ecb n\u00e0y, s\u01a1 \u0111\u1ed3 ch\u1ec9 l\u00e0 m\u1ed9t b\u1ea3n ph\u00e1c th\u1ea3o, kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t b\u1ee9c \u1ea3nh ch\u1ee5p th\u1ef1c t\u1ebf.<\/p>\n

              7. S\u1ef1 kh\u00f4ng nh\u1ea5t qu\u00e1n v\u1edbi S\u01a1 \u0111\u1ed3 L\u1edbp \ud83d\udd04<\/h2>\n

              S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c suy ra t\u1eeb s\u01a1 \u0111\u1ed3 l\u1edbp. N\u00f3 kh\u00f4ng \u0111\u01b0\u1ee3c m\u00e2u thu\u1eabn v\u1edbi c\u1ea5u tr\u00fac \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a \u1edf c\u1ea5p \u0111\u1ed9 cao h\u01a1n. M\u1ed9t l\u1ed7i ph\u1ed5 bi\u1ebfn l\u00e0 th\u00eam c\u00e1c thu\u1ed9c t\u00ednh, thao t\u00e1c ho\u1eb7c quan h\u1ec7 v\u00e0o s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng m\u00e0 kh\u00f4ng t\u1ed3n t\u1ea1i trong s\u01a1 \u0111\u1ed3 l\u1edbp t\u01b0\u01a1ng \u1ee9ng.<\/p>\n

                \n
              • L\u1ed7i:<\/strong>Th\u00eam m\u1ed9t \u0111\u01b0\u1eddng quan h\u1ec7 m\u1edbi v\u00e0o m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng ch\u01b0a \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong l\u1edbp.<\/li>\n
              • C\u00e1ch kh\u1eafc ph\u1ee5c:<\/strong>\u0110\u1ed1i chi\u1ebfu t\u1eebng li\u00ean k\u1ebft trong s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng v\u1edbi \u0111\u1ecbnh ngh\u0129a c\u1ee7a s\u01a1 \u0111\u1ed3 l\u1edbp.<\/li>\n
              • T\u00e1c \u0111\u1ed9ng:<\/strong>S\u1ef1 nh\u1ea7m l\u1eabn v\u1ec1 ph\u1ea1m vi c\u1ee7a h\u1ec7 th\u1ed1ng v\u00e0 c\u00e1c m\u00f4 h\u00ecnh d\u1eef li\u1ec7u kh\u00f4ng h\u1ee3p l\u1ec7.<\/li>\n<\/ul>\n

                N\u1ebfu s\u01a1 \u0111\u1ed3 l\u1edbp kh\u00f4ng \u0111\u1ecbnh ngh\u0129a m\u1ed9t quan h\u1ec7 gi\u1eefa S\u1ea3n ph\u1ea9m<\/code> v\u00e0 \u0110\u00e1nh gi\u00e1<\/code>, s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng th\u1ec3 hi\u1ec3n th\u1ecb m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a S\u1ea3n ph\u1ea9m<\/code> \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a \u0110\u00e1nh gi\u00e1<\/code>. \u0110i\u1ec1u n\u00e0y vi ph\u1ea1m h\u1ee3p \u0111\u1ed3ng logic c\u1ee7a m\u00f4 h\u00ecnh. T\u00ednh nh\u1ea5t qu\u00e1n \u0111\u1ea3m b\u1ea3o r\u1eb1ng vi\u1ec7c tri\u1ec3n khai c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng th\u1ef1c s\u1ef1 theo thi\u1ebft k\u1ebf.<\/p>\n

                8. L\u00e0m qu\u00e1 t\u1ea3i b\u1ee9c \u1ea3nh ch\u1ee5p \ud83d\udcc9<\/h2>\n

                Sinh vi\u00ean th\u01b0\u1eddng c\u1ea3m th\u1ea5y b\u1eaft bu\u1ed9c ph\u1ea3i hi\u1ec3n th\u1ecb m\u1ecdi \u0111\u1ed1i t\u01b0\u1ee3ng trong m\u1ed9t h\u1ec7 th\u1ed1ng tr\u00ean m\u1ed9t s\u01a1 \u0111\u1ed3 duy nh\u1ea5t. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn c\u00e1c h\u00ecnh \u1ea3nh l\u1ed9n x\u1ed9n v\u00e0 kh\u00f3 \u0111\u1ecdc. M\u1ed9t s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng nh\u1eb1m minh h\u1ecda m\u1ed9t k\u1ecbch b\u1ea3n ho\u1eb7c tr\u1ea1ng th\u00e1i c\u1ee5 th\u1ec3, ch\u1ee9 kh\u00f4ng ph\u1ea3i to\u00e0n b\u1ed9 c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/p>\n

                  \n
                • L\u1ed7i:<\/strong>Bao g\u1ed3m h\u00e0ng tr\u0103m th\u1ec3 hi\u1ec7n trong m\u1ed9t khung nh\u00ecn duy nh\u1ea5t.<\/li>\n
                • C\u00e1ch kh\u1eafc ph\u1ee5c:<\/strong>Gi\u1edbi h\u1ea1n s\u01a1 \u0111\u1ed3 ch\u1ec9 bao g\u1ed3m c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng li\u00ean quan cho tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng c\u1ee5 th\u1ec3 \u0111ang \u0111\u01b0\u1ee3c m\u00f4 h\u00ecnh h\u00f3a.<\/li>\n
                • T\u00e1c \u0111\u1ed9ng:<\/strong>M\u1ea5t \u0111i s\u1ef1 r\u00f5 r\u00e0ng v\u00e0 kh\u00f4ng th\u1ec3 nh\u00ecn th\u1ea5y c\u00e1c quan h\u1ec7 then ch\u1ed1t.<\/li>\n<\/ul>\n

                  N\u1ebfu b\u1ea1n \u0111ang m\u00f4 h\u00ecnh h\u00f3a quy tr\u00ecnh \u0111\u0103ng nh\u1eadp, b\u1ea1n kh\u00f4ng c\u1ea7n hi\u1ec3n th\u1ecb c\u00e1c \u0110\u01a1n h\u00e0ng<\/code> ho\u1eb7c c\u00e1c H\u00e0ng t\u1ed3n kho<\/code> c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng tr\u1eeb khi ch\u00fang tham gia tr\u1ef1c ti\u1ebfp. T\u1eadp trung v\u00e0o Ng\u01b0\u1eddi d\u00f9ng<\/code>, Phi\u00ean<\/code>, v\u00e0 B\u1ed9 x\u00e1c th\u1ef1c<\/code>. Vi\u1ec7c gi\u1eef ph\u1ea1m vi h\u1eb9p gi\u00fap bi\u1ec3u \u0111\u1ed3 tr\u1edf th\u00e0nh c\u00f4ng c\u1ee5 giao ti\u1ebfp h\u1eefu \u00edch thay v\u00ec m\u1ed9t b\u1ee9c t\u01b0\u1eddng ch\u1eef.<\/p>\n

                  9. B\u1ecf qua c\u00e1c tr\u1ea1ng th\u00e1i v\u00f2ng \u0111\u1eddi \u23f3<\/h2>\n

                  C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng t\u0129nh; ch\u00fang di chuy\u1ec3n qua c\u00e1c tr\u1ea1ng th\u00e1i. Trong khi bi\u1ec3u \u0111\u1ed3 tr\u1ea1ng th\u00e1i \u0111\u1ec1 c\u1eadp \u0111i\u1ec1u n\u00e0y m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng, bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 g\u1ee3i \u00fd v\u1ec1 tr\u1ea1ng th\u00e1i v\u00f2ng \u0111\u1eddi. Sinh vi\u00ean th\u01b0\u1eddng b\u1ecf qua tr\u1ea1ng th\u00e1i c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng khi t\u1ea1o th\u1ec3 hi\u1ec7n.<\/p>\n

                    \n
                  • L\u1ed7i:<\/strong> Coi t\u1ea5t c\u1ea3 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u00e3 \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o \u0111\u1ea7y \u0111\u1ee7 v\u00e0 \u0111ang ho\u1ea1t \u0111\u1ed9ng.<\/li>\n
                  • C\u00e1ch s\u1eeda:<\/strong> Ch\u1ec9 r\u00f5 c\u00e1c tr\u1ea1ng th\u00e1i khi c\u1ea7n thi\u1ebft (v\u00ed d\u1ee5: order1 : \u0110\u01a1n h\u00e0ng<\/code> [\u0111ang ch\u1edd]).<\/li>\n
                  • T\u00e1c \u0111\u1ed9ng:<\/strong> Kh\u00f4ng n\u1eafm b\u1eaft \u0111\u01b0\u1ee3c c\u00e1c tr\u1ea1ng th\u00e1i t\u1ea1m th\u1eddi, v\u1ed1n r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi logic h\u1ec7 th\u1ed1ng.<\/li>\n<\/ul>\n

                    M\u1ed9t s\u1ed1 c\u00f4ng c\u1ee5 m\u00f4 h\u00ecnh h\u00f3a cho ph\u00e9p b\u1ea1n ch\u1ec9 \u0111\u1ecbnh tr\u1ea1ng th\u00e1i c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng tr\u1ef1c ti\u1ebfp trong bi\u1ec3u \u0111\u1ed3. N\u1ebfu m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng \u1edf tr\u1ea1ng th\u00e1i \u201c\u0110\u00e3 t\u1ea1o\u201d thay v\u00ec tr\u1ea1ng th\u00e1i \u201c\u0110\u00e3 x\u00f3a\u201d, \u0111i\u1ec1u n\u00e0y \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1ch h\u1ec7 th\u1ed1ng x\u1eed l\u00fd n\u00f3. Vi\u1ec7c b\u1ecf qua s\u1eafc th\u00e1i n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn l\u1ed7i logic khi h\u1ec7 th\u1ed1ng c\u1ed1 g\u1eafng x\u1eed l\u00fd m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng t\u1ed3n t\u1ea1i ho\u1eb7c \u0111\u00e3 ho\u00e0n t\u1ea5t.<\/p>\n

                    10. B\u1ed1 c\u1ee5c v\u00e0 kho\u1ea3ng c\u00e1ch h\u00ecnh \u1ea3nh k\u00e9m \ud83d\udcd0<\/h2>\n

                    Bi\u1ec3u \u0111\u1ed3 l\u00e0 c\u00f4ng c\u1ee5 giao ti\u1ebfp. N\u1ebfu n\u00f3 h\u1ed7n lo\u1ea1n v\u1ec1 m\u1eb7t h\u00ecnh \u1ea3nh, th\u00f4ng tin s\u1ebd b\u1ecb m\u1ea5t. Sinh vi\u00ean th\u01b0\u1eddng \u0111\u1eb7t c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ng\u1eabu nhi\u00ean m\u00e0 kh\u00f4ng quan t\u00e2m \u0111\u1ebfn vi\u1ec7c nh\u00f3m ho\u1eb7c c\u0103n ch\u1ec9nh. \u0110i\u1ec1u n\u00e0y khi\u1ebfn vi\u1ec7c theo d\u00f5i c\u00e1c k\u1ebft n\u1ed1i tr\u1edf n\u00ean kh\u00f3 kh\u0103n.<\/p>\n

                      \n
                    • L\u1ed7i:<\/strong> S\u1eafp x\u1ebfp ng\u1eabu nhi\u00ean c\u00e1c h\u1ed9p v\u1edbi c\u00e1c \u0111\u01b0\u1eddng c\u1eaft nhau v\u00e0 kh\u00f4ng c\u00f3 nh\u00f3m.<\/li>\n
                    • C\u00e1ch s\u1eeda:<\/strong> Nh\u00f3m c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng li\u00ean quan m\u1ed9t c\u00e1ch h\u1ee3p l\u00fd. S\u1eed d\u1ee5ng c\u0103n ch\u1ec9nh v\u00e0 kho\u1ea3ng c\u00e1ch \u0111\u1ec3 t\u1ea1o ra th\u1ee9 b\u1eadc h\u00ecnh \u1ea3nh.<\/li>\n
                    • T\u00e1c \u0111\u1ed9ng:<\/strong> T\u0103ng t\u1ea3i nh\u1eadn th\u1ee9c cho ng\u01b0\u1eddi \u0111\u1ecdc v\u00e0 nguy c\u01a1 hi\u1ec3u sai c\u00e1c k\u1ebft n\u1ed1i.<\/li>\n<\/ul>\n

                      S\u1eafp x\u1ebfp bi\u1ec3u \u0111\u1ed3 sao cho lu\u1ed3ng d\u1eef li\u1ec7u tr\u1edf n\u00ean r\u00f5 r\u00e0ng v\u1ec1 m\u1eb7t h\u00ecnh \u1ea3nh. N\u1ebfu \u0110\u1ed1i t\u01b0\u1ee3ng A<\/code> k\u1ebft n\u1ed1i v\u1edbi \u0110\u1ed1i t\u01b0\u1ee3ng B<\/code>, \u0111\u1eb7t ch\u00fang \u0111\u1ee7 g\u1ea7n \u0111\u1ec3 gi\u1ea3m thi\u1ec3u \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng k\u1ebb. Tr\u00e1nh \u0111\u1ec3 c\u00e1c \u0111\u01b0\u1eddng c\u1eaft ngang qua c\u00e1c h\u1ed9p kh\u00e1c tr\u1eeb khi c\u1ea7n thi\u1ebft. M\u1ed9t b\u1ed1 c\u1ee5c s\u1ea1ch s\u1ebd b\u00e1o hi\u1ec7u m\u1ed9t thi\u1ebft k\u1ebf s\u1ea1ch s\u1ebd.<\/p>\n

                      T\u00f3m t\u1eaft b\u1ea3ng c\u00e1c l\u1ed7i th\u01b0\u1eddng g\u1eb7p \ud83d\udcca<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n
                      Danh m\u1ee5c l\u1ed7i<\/th>\nL\u1ed7i \u0111i\u1ec3n h\u00ecnh<\/th>\nPh\u01b0\u01a1ng ph\u00e1p \u0111\u00fang<\/th>\n<\/tr>\n<\/thead>\n
                      Nh\u1eadn d\u1ea1ng<\/td>\nThi\u1ebfu t\u00ean \u0111\u1ed1i t\u01b0\u1ee3ng<\/td>\nS\u1eed d\u1ee5ng “t\u00ean : L\u1edbp<\/em> \u0111\u1ecbnh d\u1ea1ng<\/td>\n<\/tr>\n
                      M\u1ed1i quan h\u1ec7<\/td>\nThi\u1ebfu t\u00ednh \u0111a tr\u1ecb<\/td>\nTu\u00e2n th\u1ee7 c\u00e1c r\u00e0ng bu\u1ed9c c\u1ee7a s\u01a1 \u0111\u1ed3 l\u1edbp<\/td>\n<\/tr>\n
                      Kh\u1ea3 n\u0103ng \u0111i\u1ec1u h\u01b0\u1edbng<\/td>\n\u0110\u01b0\u1eddng kh\u00f4ng c\u00f3 h\u01b0\u1edbng<\/td>\nS\u1eed d\u1ee5ng m\u0169i t\u00ean \u0111\u1ec3 th\u1ec3 hi\u1ec7n lu\u1ed3ng<\/td>\n<\/tr>\n
                      D\u1eef li\u1ec7u<\/td>\nKh\u00f4ng c\u00f3 gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh<\/td>\nHi\u1ec3n th\u1ecb d\u1eef li\u1ec7u c\u1ee5 th\u1ec3 c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng<\/td>\n<\/tr>\n
                      T\u00ednh nh\u1ea5t qu\u00e1n<\/td>\nM\u1ed1i quan h\u1ec7 m\u1edbi<\/td>\nPh\u00f9 h\u1ee3p v\u1edbi c\u1ea5u tr\u00fac s\u01a1 \u0111\u1ed3 l\u1edbp<\/td>\n<\/tr>\n
                      Ph\u1ea1m vi<\/td>\nQu\u00e1 nhi\u1ec1u \u0111\u1ed1i t\u01b0\u1ee3ng<\/td>\nT\u1eadp trung v\u00e0o t\u1eadp con li\u00ean quan<\/td>\n<\/tr>\n
                      H\u00ecnh \u1ea3nh<\/td>\n\u0110\u01b0\u1eddng c\u1eaft nhau<\/td>\nX\u1ebfp th\u1eb3ng h\u00e0ng v\u00e0 nh\u00f3m m\u1ed9t c\u00e1ch h\u1ee3p l\u00fd<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                      Kh\u00e1m ph\u00e1 s\u00e2u: Ng\u1eef ngh\u0129a m\u1ed1i quan h\u1ec7 \ud83e\udde0<\/h2>\n

                      Vi\u1ec7c hi\u1ec3u \u00fd ngh\u0129a ng\u1eef ngh\u0129a c\u1ee7a c\u00e1c m\u1ed1i quan h\u1ec7 l\u00e0 r\u1ea5t quan tr\u1ecdng. M\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u01a1n gi\u1ea3n kh\u00f4ng truy\u1ec1n t\u1ea3i \u0111\u1ee7 th\u00f4ng tin. Sinh vi\u00ean th\u01b0\u1eddng gi\u1ea3 \u0111\u1ecbnh r\u1eb1ng m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng ng\u1ee5 \u00fd m\u1ed9t kh\u00f3a ngo\u1ea1i tr\u1ef1c ti\u1ebfp trong c\u01a1 s\u1edf d\u1eef li\u1ec7u. M\u1eb7c d\u00f9 \u0111i\u1ec1u n\u00e0y th\u01b0\u1eddng \u0111\u00fang, nh\u01b0ng n\u00f3 kh\u00f4ng ph\u1ea3i l\u00e0 quy t\u1eafc. M\u1ed1i quan h\u1ec7 \u0111\u1ea1i di\u1ec7n cho m\u1ed9t k\u1ebft n\u1ed1i logic.<\/p>\n

                      H\u00e3y xem x\u00e9t m\u1ed9t h\u1ec7 th\u1ed1ngTh\u01b0 vi\u1ec7n<\/code>. M\u1ed9t cu\u1ed1ns\u00e1ch<\/code>c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi m\u1ed9tth\u1ec3 lo\u1ea1i<\/code>. N\u1ebfu bi\u1ec3u \u0111\u1ed3 l\u1edbp th\u1ec3 hi\u1ec7n m\u1ed1i quan h\u1ec7 nhi\u1ec1u-nhi\u1ec1u, th\u00ec bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng ph\u1ea3i ph\u1ea3n \u00e1nh r\u1eb1ng m\u1ed9t th\u1ec3 hi\u1ec7n s\u00e1ch c\u1ee5 th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi m\u1ed9t th\u1ec3 hi\u1ec7n th\u1ec3 lo\u1ea1i c\u1ee5 th\u1ec3. Tuy nhi\u00ean, n\u1ebfu vi\u1ec7c tri\u1ec3n khai h\u1ec7 th\u1ed1ng s\u1eed d\u1ee5ng b\u1ea3ng trung gian, bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng v\u1eabn c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb m\u1ed9t li\u00ean k\u1ebft tr\u1ef1c ti\u1ebfp t\u00f9y thu\u1ed9c v\u00e0o m\u1ee9c \u0111\u1ed9 tr\u1eebu t\u01b0\u1ee3ng. Ch\u00eca kh\u00f3a \u1edf \u0111\u00e2y l\u00e0 s\u1ef1 nh\u1ea5t qu\u00e1n v\u1edbi \u00fd \u0111\u1ecbnh thi\u1ebft k\u1ebf, ch\u1ee9 kh\u00f4ng nh\u1ea5t thi\u1ebft l\u00e0 vi\u1ec7c tri\u1ec3n khai v\u1eadt l\u00fd.<\/p>\n

                      Sinh vi\u00ean th\u01b0\u1eddng qu\u00ean \u0111\u00e1nh d\u1ea5u c\u00e1c \u0111\u1ea7u m\u1ed1i quan h\u1ec7 b\u1eb1ng t\u00ean vai tr\u00f2. N\u1ebfu m\u1ed9tng\u01b0\u1eddi d\u00f9ng<\/code>c\u00f3 m\u1ed1i quan h\u1ec7 v\u1edbi\u0111\u01a1n h\u00e0ng<\/code>, th\u00ec vai tr\u00f2 \u1edf \u0111\u1ea7u Ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 l\u00e0 ‘\u0111\u1eb7t’ v\u00e0 vai tr\u00f2 \u1edf \u0111\u1ea7u \u0110\u01a1n h\u00e0ng c\u00f3 th\u1ec3 l\u00e0 ‘\u0111\u01b0\u1ee3c \u0111\u1eb7t b\u1edfi’. Vi\u1ec7c b\u1ecf qua c\u00e1c t\u00ean n\u00e0y khi\u1ebfn bi\u1ec3u \u0111\u1ed3 kh\u00f3 \u0111\u1ecdc h\u01a1n. Lu\u00f4n bao g\u1ed3m t\u00ean vai tr\u00f2 khi ch\u00fang gi\u00fap l\u00e0m r\u00f5 \u00fd ngh\u0129a.<\/p>\n

                      Danh s\u00e1ch ki\u1ec3m tra c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t \u2705<\/h2>\n

                      \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a b\u1ea1n ch\u00ednh x\u00e1c v\u00e0 h\u1eefu \u00edch, h\u00e3y tu\u00e2n theo danh s\u00e1ch ki\u1ec3m tra n\u00e0y tr\u01b0\u1edbc khi ho\u00e0n thi\u1ec7n c\u00f4ng vi\u1ec7c c\u1ee7a m\u00ecnh.<\/p>\n

                        \n
                      • Ki\u1ec3m tra vi\u1ec7c \u0111\u1eb7t t\u00ean:<\/strong>M\u1ecdi \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 t\u00ean th\u1ec3 hi\u1ec7n kh\u00f4ng?<\/li>\n
                      • Ki\u1ec3m tra t\u00ednh \u0111a tr\u1ecb:<\/strong>C\u00e1c li\u00ean k\u1ebft c\u00f3 kh\u1edbp v\u1edbi c\u00e1c r\u00e0ng bu\u1ed9c c\u1ee7a bi\u1ec3u \u0111\u1ed3 l\u1edbp kh\u00f4ng?<\/li>\n
                      • X\u00e1c th\u1ef1c gi\u00e1 tr\u1ecb:<\/strong>C\u00e1c gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh c\u00f3 th\u1ef1c t\u1ebf cho t\u00ecnh hu\u1ed1ng n\u00e0y kh\u00f4ng?<\/li>\n
                      • Xem x\u00e9t c\u00e1c li\u00ean k\u1ebft:<\/strong>T\u1ea5t c\u1ea3 c\u00e1c m\u0169i t\u00ean c\u00f3 ch\u1ec9 theo h\u01b0\u1edbng \u0111\u00fang kh\u00f4ng?<\/li>\n
                      • Ki\u1ec3m tra t\u00ednh nh\u1ea5t qu\u00e1n:<\/strong>T\u1ea5t c\u1ea3 c\u00e1c m\u1ed1i quan h\u1ec7 c\u00f3 t\u1ed3n t\u1ea1i trong bi\u1ec3u \u0111\u1ed3 l\u1edbp kh\u00f4ng?<\/li>\n
                      • \u0110\u00e1nh gi\u00e1 t\u00ednh r\u00f5 r\u00e0ng:<\/strong>B\u1ed1 c\u1ee5c c\u00f3 d\u1ec5 theo d\u00f5i m\u00e0 kh\u00f4ng c\u00f3 c\u00e1c \u0111\u01b0\u1eddng c\u1eaft nhau kh\u00f4ng?<\/li>\n
                      • Gi\u1edbi h\u1ea1n ph\u1ea1m vi:<\/strong>Ch\u1ec9 c\u00f3 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ea7n thi\u1ebft \u0111\u01b0\u1ee3c bao g\u1ed3m kh\u00f4ng?<\/li>\n
                      • G\u00e1n nh\u00e3n vai tr\u00f2:<\/strong>C\u00e1c vai tr\u00f2 quan h\u1ec7 c\u00f3 \u0111\u01b0\u1ee3c \u0111\u1eb7t t\u00ean khi c\u1ea7n thi\u1ebft kh\u00f4ng?<\/li>\n<\/ul>\n

                        Tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n n\u00e0y gi\u00fap gi\u1ea3m t\u1ea3i nh\u1eadn th\u1ee9c cho b\u1ea5t k\u1ef3 ai \u0111\u1ecdc t\u00e0i li\u1ec7u c\u1ee7a b\u1ea1n. N\u00f3 c\u0169ng gi\u1ea3m thi\u1ec3u r\u1ee7i ro hi\u1ec3u l\u1ea7m trong giai \u0111o\u1ea1n ph\u00e1t tri\u1ec3n. M\u1ed9t bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng t\u1ed1t \u0111\u00f3ng vai tr\u00f2 nh\u01b0 c\u1ea7u n\u1ed1i gi\u1eefa thi\u1ebft k\u1ebf v\u00e0 m\u00e3 ngu\u1ed3n.<\/p>\n

                        Nh\u1eefng suy ngh\u0129 cu\u1ed1i c\u00f9ng v\u1ec1 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a m\u00f4 h\u00ecnh h\u00f3a \ud83c\udfaf<\/h2>\n

                        \u0110\u1ed9 ch\u00ednh x\u00e1c trong m\u00f4 h\u00ecnh h\u00f3a kh\u00f4ng ph\u1ea3i l\u00e0 v\u1ec1 s\u1ef1 ho\u00e0n h\u1ea3o; \u0111\u00f3 l\u00e0 v\u1ec1 s\u1ef1 r\u00f5 r\u00e0ng v\u00e0 \u00fd \u0111\u1ed3. Khi b\u1ea1n tr\u00e1nh nh\u1eefng l\u1ed7i ph\u1ed5 bi\u1ebfn n\u00e0y, b\u1ea1n t\u1ea1o ra c\u00e1c bi\u1ec3u \u0111\u1ed3 th\u1ef1c s\u1ef1 ph\u1ee5c v\u1ee5 m\u1ee5c \u0111\u00edch c\u1ee7a ch\u00fang. Ch\u00fang tr\u1edf th\u00e0nh c\u00f4ng c\u1ee5 ph\u00e2n t\u00edch thay v\u00ec ch\u1ec9 l\u00e0 c\u00e1c s\u1ea3n ph\u1ea9m \u0111\u1ec3 tu\u00e2n th\u1ee7. H\u00e3y nh\u1edb r\u1eb1ng bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 m\u1ed9t bi\u1ec3u di\u1ec5n c\u1ee7a m\u1ed9t kho\u1ea3nh kh\u1eafc trong th\u1eddi gian. N\u00f3 n\u1eafm b\u1eaft m\u1ed9t tr\u1ea1ng th\u00e1i m\u00e0 h\u1ec7 th\u1ed1ng \u0111i qua. B\u1eb1ng c\u00e1ch x\u1eed l\u00fd n\u00f3 v\u1edbi s\u1ef1 nghi\u00eam ng\u1eb7t c\u1ee7a m\u1ed9t bi\u1ec3u \u0111\u1ed3 l\u1edbp, b\u1ea1n \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u00f4 h\u00ecnh v\u1eabn l\u00e0 ngu\u1ed3n s\u1ef1 th\u1eadt \u0111\u00e1ng tin c\u1eady trong su\u1ed1t v\u00f2ng \u0111\u1eddi ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m.<\/p>\n

                        H\u00e3y d\u00e0nh th\u1eddi gian xem l\u1ea1i c\u00f4ng vi\u1ec7c c\u1ee7a b\u1ea1n so v\u1edbi danh s\u00e1ch ki\u1ec3m tra. \u0110\u1ea3m b\u1ea3o r\u1eb1ng m\u1ed7i d\u00f2ng \u0111\u1ec1u c\u00f3 \u00fd ngh\u0129a v\u00e0 m\u1ed7i nh\u00e3n \u0111\u1ec1u ch\u00ednh x\u00e1c. S\u1ef1 ch\u00fa \u00fd \u0111\u1ebfn chi ti\u1ebft n\u00e0y ph\u00e2n bi\u1ec7t m\u1ed9t ng\u01b0\u1eddi m\u00f4 h\u00ecnh h\u00f3a m\u1edbi b\u1eaft \u0111\u1ea7u v\u1edbi m\u1ed9t ki\u1ebfn tr\u00fac s\u01b0 c\u00f3 k\u1ef9 n\u0103ng. H\u00e3y t\u1eadp trung v\u00e0o c\u00e1c quan h\u1ec7 v\u00e0 d\u1eef li\u1ec7u, v\u00e0 c\u1ea5u tr\u00fac s\u1ebd t\u1ef1 nhi\u00ean h\u00ecnh th\u00e0nh.<\/p>\n

                        K\u1ebft lu\u1eadn \ud83c\udfc1<\/h2>\n

                        T\u1ea1o bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u00f2i h\u1ecfi s\u1ef1 ch\u00ednh x\u00e1c v\u00e0 hi\u1ec3u bi\u1ebft s\u00e2u s\u1eafc v\u1ec1 c\u00e1c tr\u1ea1ng th\u00e1i h\u1ec7 th\u1ed1ng. B\u1eb1ng c\u00e1ch tr\u00e1nh nh\u1eefng c\u1ea1m b\u1eaby \u0111\u01b0\u1ee3c n\u00eau trong h\u01b0\u1edbng d\u1eabn n\u00e0y, b\u1ea1n \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c m\u00f4 h\u00ecnh c\u1ee7a m\u00ecnh r\u00f5 r\u00e0ng, ch\u00ednh x\u00e1c v\u00e0 h\u1eefu \u00edch. H\u00e3y t\u1eadp trung v\u00e0o m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c \u0111\u1ecbnh ngh\u0129a l\u1edbp v\u00e0 d\u1eef li\u1ec7u th\u1ef1c th\u1ec3. Duy tr\u00ec s\u1ef1 nh\u1ea5t qu\u00e1n trong to\u00e0n b\u1ed9 t\u00e0i li\u1ec7u c\u1ee7a b\u1ea1n. V\u1edbi th\u1ef1c h\u00e0nh, nh\u1eefng l\u1ed7i n\u00e0y s\u1ebd tr\u1edf n\u00ean \u00edt ph\u1ed5 bi\u1ebfn h\u01a1n, v\u00e0 c\u00e1c bi\u1ec3u \u0111\u1ed3 c\u1ee7a b\u1ea1n s\u1ebd tr\u1edf th\u00e0nh c\u00f4ng c\u1ee5 giao ti\u1ebfp hi\u1ec7u qu\u1ea3 h\u01a1n.<\/p>\n","protected":false},"excerpt":{"rendered":"

                        Bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 m\u1ed9t th\u00e0nh ph\u1ea7n quan tr\u1ecdng trong t\u00e0i li\u1ec7u Ng\u00f4n ng\u1eef M\u00f4 h\u00ecnh h\u00f3a Th\u1ed1ng nh\u1ea5t (UML). Ch\u00fang cung c\u1ea5p m\u1ed9t b\u1ee9c \u1ea3nh t\u0129nh c\u1ee7a h\u1ec7…<\/p>\n","protected":false},"author":1,"featured_media":1731,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"Nh\u1eefng l\u1ed7i ph\u1ed5 bi\u1ebfn trong bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng m\u00e0 sinh vi\u00ean th\u01b0\u1eddng tr\u00e1nh \ud83d\udcc9","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1c l\u1ed7i th\u01b0\u1eddng g\u1eb7p trong bi\u1ec3u \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UML. 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