[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fGQ20Dc6Bef8habVyDD5nKuwGR4zhaLjcXk0MrWb54pI":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":10,"question":16,"related":17,"source":27,"type":41},[],"2023-05-09 11:31:51",968404219,[8,9],"对","错",{"courseId":11,"courseImg":12,"courseName":13,"workId":14,"workName":15},"1000010444","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd2537b9e0d17a5c721226d985c8eca5e.png","数据库原理","55200068","数据库原理教程考试","在数据库恢复中,针对不同的故障,系统的恢复策略也不同",[18,29,38,42,49,58,67,76,85,90],{"answer":19,"createTime":5,"id":20,"options":21,"question":26,"source":27,"type":28},[],968404212,[22,23,24,25],"一个实体模型转换为一个关系模式","一个1:1联系可以转换为一个独立的关系模式,也可以与联系的任意一端实体所对应的关系模式合并","一个1:n联系可以转换为一个独立的关系模式,也可以与联系的任意一端实体所对应的关系模式合并","一个m:n联系转换为一个关系模式","下列有关E-R模型向关系模型转换的叙述中,不正确的是()","v2",0,{"answer":30,"createTime":5,"id":31,"options":32,"question":37,"source":27,"type":28},[],968404216,[33,34,35,36],"物理结构设计","需求分析","概念设计","逻辑结构设计","数据库设计过程中,如何构造出一个合适的数据逻辑结构是( )主要解决的问题",{"answer":39,"createTime":5,"id":6,"options":40,"question":16,"source":27,"type":41},[],[8,9],3,{"answer":43,"createTime":5,"id":44,"options":45,"question":48,"source":27,"type":28},[],968404220,[34,35,46,47],"逻辑设计","物理设计","在关系数据库设计中,对关系进行规范化处理,使关系达到一定的范式,例如达到3NF是( )阶段的任务",{"answer":50,"createTime":5,"id":51,"options":52,"question":57,"source":27,"type":28},[],968404225,[53,54,55,56],"数据库应用系统开发工具","数据库管理系统软件","画E-R图的软件","调试系统","Oracle软件是一种()",{"answer":59,"createTime":5,"id":60,"options":61,"question":66,"source":27,"type":28},[],968404243,[62,63,64,65],"多于","少于","等于","不确定","在关系代数中,对一个关系只做投影操作后,结果的元组个数( )原来关系的元组个数",{"answer":68,"createTime":5,"id":69,"options":70,"question":75,"source":27,"type":28},[],968404245,[71,72,73,74],"1","2","3","0","有两个关系R(A,B,C)和S(B,C),将R和S进行除运算,得到的结果包含几个列( )",{"answer":77,"createTime":5,"id":78,"options":79,"question":84,"source":27,"type":28},[],968404251,[80,81,82,83],"属性个数相同","相同属性","相同关系名","相同码","两个关系进行自然连接运算,必须满足( )",{"answer":86,"createTime":5,"id":87,"options":88,"question":89,"source":27,"type":41},[],968404252,[8,9],"如果有属性不在函数依赖集中任何函数依赖的右边出现,那么它必须包含在候选码中",{"answer":91,"createTime":5,"id":92,"options":93,"question":94,"source":27,"type":41},[],968404256,[8,9],"任何一个包含两个属性的关系模式一定满足BCNF"]