[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f-Sivn37Ir-BhH4cv1o9OkDG5yGfwfXtvkjABkY6ZT3w":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":13,"question":20,"related":21,"source":25,"type":26},[],"2023-05-10 20:19:19",4634927,[8,9,10,11,12],"关系名","属性","属性所来自的域","属性到域的映射","U上的数据依赖",{"count":14,"courseId":15,"courseImg":16,"courseName":17,"workId":18,"workName":19},17,"4a27a73c8c4f9343deb3f6e61f80087b","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F88d83025ea20cb47be7fee9830a1a59c.jpg","数据库原理及应用","d9ef0cf6645c4f68adbbe440b924b0be","4.1 规范化——函数依赖、码","关系模式有五部分组成R(U,D,DOM,F),其中D是指( ),DOM是指( )",[22,27,34,40,49,58,65,71,76,81],{"answer":23,"createTime":5,"id":6,"options":24,"question":20,"source":25,"type":26},[],[8,9,10,11,12],"v1",1,{"answer":28,"createTime":29,"id":30,"options":31,"question":32,"source":25,"type":33},[],"2026-04-30 07:42:09",6179248,[],"数据依赖分为哪两类 和",2,{"answer":35,"createTime":36,"id":37,"options":38,"question":39,"source":25,"type":33},[],"2025-06-08 19:45:12",6179249,[],"若X→Y,则X称为这个函数依赖的",{"answer":41,"createTime":42,"id":43,"options":44,"question":47,"source":25,"type":48},[],"2023-05-11 20:20:39",6179250,[45,46],"正确","错误","函数依赖不是指关系模式R的所有关系实例均要满足的约束条件,而是指R的某个或某些关系实例满足的约束条件",3,{"answer":50,"createTime":51,"id":52,"options":53,"question":56,"source":25,"type":57},[],"2024-06-04 22:19:04",6179251,[54,55],"非平凡的函数依赖","平凡的函数依赖","X→Y,但Y⊈X则称X→Y是( )X→Y,但Y⊆X则称X→Y是( )",13,{"answer":59,"createTime":51,"id":60,"options":61,"question":64,"source":25,"type":57},[],6179252,[62,63],"X←→Y","X↛Y","若X→Y,Y→X,则记作( )若Y不函数依赖于X,则记作( )",{"answer":66,"createTime":29,"id":67,"options":68,"question":69,"source":25,"type":70},[],355066097,[],"简述函数依赖的定义",4,{"answer":72,"createTime":29,"id":73,"options":74,"question":75,"source":25,"type":70},[],355066098,[],"简述完全函数依赖",{"answer":77,"createTime":29,"id":78,"options":79,"question":80,"source":25,"type":70},[],355066099,[],"简述部分函数依赖",{"answer":82,"createTime":29,"id":83,"options":84,"question":85,"source":25,"type":70},[],355066100,[],"简述传递函数依赖"]