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databases 螔维蟽蔚喂蟼 螖蔚未慰渭苇谓蠅谓 危蠂蔚蟽喂伪魏蠈 螠慰谓蟿苇位慰 relational model sql constraints join mysql workbench 危蠀纬魏蔚谓蟿蟻蠅蟿喂魏慰委 违蟺慰位慰纬喂蟽渭慰 exists having 螘蟻蠅蟿萎渭伪蟿伪 螤慰位位伪蟺位蠋谓 危蠂苇蟽蔚蠅 any all 违蟺慰蔚蚁蝇蟿萎渭伪蟿伪 纬位蠋蟽蟽伪 sql 韦蠉蟺慰喂 螖蔚未慰渭苇谓蠅谓 data types e/r 伪蟽胃蔚谓萎 慰谓蟿慰蟽蠉谓慰位伪 modeling 慰谓蟿蠈蟿畏蟿蔚蟼 蟽蠀蟽蠂蔚蟿委蟽蔚喂蟼 entity relationship 位慰纬伪蚁喂伪蟽渭慰委 未喂魏伪喂蠋渭伪蟿伪 rights accounts views 蠈蠄蔚喂蟼 蔚蠀蚁蔚蟿萎蚁喂伪 indexes restrict cascade foreign keys