[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fU8ZLgI1CRAKHDzkzigueSGxgc70eEYf6wZLpkwnvGxo":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2024-12-25 15:12:54",173897540,[8,9,10,11],"完整性控制","并发控制工28数据据的正确、有效和相容称之为数据的DA安全性B. 一致性C.独立性 D. 完整性","安全性控制","事务控制",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},112,"d03bc3a3de65bbf6f18bbf300f78cada","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F48eba3395437dd881b1b9275a0ad1028.png","网络工程","exam_144279944","数据库","为保证多用户环境中数据的完整性和一致性,DBMS 采取的控制称为( )",[21,32,41,50,59,68,71,80,89,94],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],173897535,[25,26,27,28],"以上都不是","必须全同","可全同","不能全同","同一关系模型的任意两个元组值","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],173897536,[36,37,38,39],"不能为空","必须唯一","必须唯一且不能为空","必须唯一但可以有空值","定义关系的主码意味着主码所包含的属性",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],173897537,[45,46,47,48],"应该插入的数据未被插入","应该删除的数据未被删除","不该删除的数据被删除","不该插入的数据被插入","关系规范化中的删除操作异常是指( )",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":30,"type":31},[],173897538,[54,55,56,57],"关系模型","层次模型","网状模型","实体-联系模型","下面模型中为概念模型的是",{"answer":60,"createTime":5,"id":61,"options":62,"question":67,"source":30,"type":31},[],173897539,[63,64,65,66],"一致性","安全性","完整性","独立性","数据库管理系统通常提供授权功能来控制不同用户访问数据的权限,这主要是为了实现数据库的",{"answer":69,"createTime":5,"id":6,"options":70,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":72,"createTime":5,"id":73,"options":74,"question":79,"source":30,"type":31},[],173897541,[75,76,77,78],"不可再分","命名在该关系模式中可以不唯一","以上都不对","可再分","关系模式的任何属性( )",{"answer":81,"createTime":5,"id":82,"options":83,"question":88,"source":30,"type":31},[],173897542,[84,85,86,87],"域完整性规则","参照完整性规则","实体完整性规则","用户自定义完整性规则","要求表中的列在组成主键的属性上不能为空,这是( )",{"answer":90,"createTime":5,"id":91,"options":92,"question":93,"source":30,"type":31},[],173897543,[63,66,65,64],"数据的正确、有效和相容称之为数据的",{"answer":95,"createTime":5,"id":96,"options":97,"question":99,"source":30,"type":31},[],173897544,[98,54,56,55],"运算模型","用树型结构表示实体之间联系的模型是"]