[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fmgIXyTMO-aCDjsctEcPufw0Mg80wtbFyHiCAfUUoSX4":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2025-05-20 11:30:19",189271452,[8,9,10,11],"实体完整性规则","参照完整性规则","用户定义完整性规则","域完整性规则",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},86,"3ca7b667f198cddd9ac7fa2e6078974f","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd5f0f9468529999f4bb0a223886d4920.jpg","数据库原理及应用","work_43732575","2025年春季学期商务文书与礼仪","设属性A 是关系R 的主属性,则属性A 不能取空值(NULL),这是_________",[21,32,41,50,59,68,77,86,89,97],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],189271445,[25,26,27,28],"INSERT","DELETE","REFERENCES","SELECT","下述SQL命令中,允许用户定义新关系时,引用其他关系的主码作为外码的是()","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],189271446,[36,37,38,39],"NOT NULL短语","UNIQUE短语","CHECK短语","HAVING短语","下述SQL命令的短语中,不用于定义属性上约束条件的是()",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],189271447,[45,46,47,48],"每个约束只能作用于一个列上","每个约束可以作用多个列,但是必须在一个表里","每个约束可以作用到多个表的多个列","以上都不对","关于约束叙述正确的是( )",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":30,"type":31},[],189271448,[54,55,56,57],"定义了一个有相关列和行的集合","当用户修改数据时,一种特殊形式的存储过程被自动执行","SQL语句的预编译集合","它根据一或多列的值,提供对数据库表的行的快速访问","下列( )是对触发器的描述",{"answer":60,"createTime":5,"id":61,"options":62,"question":67,"source":30,"type":31},[],189271449,[63,64,65,66],"实体完整性","参照完整性","用户自定义","用户操作","在数据库的表定义在,限制成绩属性列的取值在0~100的范围内,属于数据的( )约束",{"answer":69,"createTime":5,"id":70,"options":71,"question":76,"source":30,"type":31},[],189271450,[72,73,74,75],"完整性","并发性","安全性","可恢复性","在数据库系统中,视图可以提供数据的( )",{"answer":78,"createTime":5,"id":79,"options":80,"question":85,"source":30,"type":31},[],189271451,[81,82,83,84],"并发控制","完整性控制","一致性控制","安全性控制","SQL语言中,用GRANT\u002FREVOKE语句实现数据库的( )",{"answer":87,"createTime":5,"id":6,"options":88,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":90,"createTime":5,"id":91,"options":92,"question":96,"source":30,"type":31},[],189271453,[93,94,95,28],"UPSET","REVOKE","GRANT","SQL中向用户授予数据的操作权限的语句是",{"answer":98,"createTime":5,"id":99,"options":100,"question":105,"source":30,"type":31},[],189271454,[101,102,103,104],"TS&ge;S&ge;C&ge;P","TS&ge;S&ge;P&ge;C","TS&ge;C&ge;S&ge;P","TS&ge;C&ge;P&ge;S","敏感度标记被分成若干级别,下列密级的次序正确的是"]