[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$falXPAuJSsCsFJh2qlZxcJqIwUDTbmfi_MUr0nIf8Fbs":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":10,"question":13,"related":14,"source":24,"type":41},[],"2025-12-13 11:20:20",1074501653,[8,9],"对","错",{"courseImg":11,"courseName":12},"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F757d92badb28516db1ac0d11a5eb7a6e.jpg","数据库原理及开发应用","唯一索引中不允许插入重复的列值.( )",[15,26,36,42,47,56,59,64,73,78],{"answer":16,"createTime":5,"id":17,"options":18,"question":23,"source":24,"type":25},[],1074501416,[19,20,21,22],"my_name","name","123","#123","下列正确的标识符有( )","v2",1,{"answer":27,"createTime":5,"id":28,"options":29,"question":34,"source":24,"type":35},[],1074501421,[30,31,32,33],"关系模型数据库系统","网状模型数据库系统","层次模型数据库系统","面向对象模型数据库系统","主流的模型数据库系统是( )",0,{"answer":37,"createTime":5,"id":38,"options":39,"question":40,"source":24,"type":41},[],1074501527,[8,9],"SQL语言中,利用字符串函数操作," SELECT LEFT('2020年02月29日',4)"的结果是字符串"2020".( )",3,{"answer":43,"createTime":5,"id":44,"options":45,"question":46,"source":24,"type":41},[],1074501545,[8,9],"用户定义完整性是指要求表中的每一行具有唯一的标识.( )",{"answer":48,"createTime":5,"id":49,"options":50,"question":55,"source":24,"type":35},[],1074501549,[51,52,53,54],"SELECT * FROM Book WHERE Author LIKE '%有为%'","SELECT * FROM Library WHERE Author LIKE '有为'","SELECT * FROM Book WHERE Author LIKE '有为'","SELECT * FROM Library WHERE Author = '有为'","要查询Library数据库Book表中作者名中含有"有为"的书籍信息,可用( )命令",{"answer":57,"createTime":5,"id":6,"options":58,"question":13,"source":24,"type":41},[],[8,9],{"answer":60,"createTime":5,"id":61,"options":62,"question":63,"source":24,"type":41},[],1074501659,[8,9],"连接是关系型数据库中常用的多表查询数据的模式.( )",{"answer":65,"createTime":5,"id":66,"options":67,"question":72,"source":24,"type":35},[],1074501668,[68,69,70,71],"abc","abcd","abcde","aceg","语句"select substring('abcdefg',1,4)"返回的结果是( )",{"answer":74,"createTime":5,"id":75,"options":76,"question":77,"source":24,"type":41},[],1074501683,[8,9],"使用SQL Server Management Studio 删除数据库后,仍然可以恢复内容.( )",{"answer":79,"createTime":5,"id":80,"options":81,"question":86,"source":24,"type":35},[],1074501738,[82,83,84,85],"select sdept ,avg(sage) from student group by sdept having avg(sage) >20","select sdept ,avg(sage) from student where ssex='女' group by sdept","select sdept ,avg(sage) from student where ssex='女' group by sdept having avg(sage) >20","select sdept ,avg(sage) from student where ssex='女' and avg(sage) >20 group by sdept","针对表Student (sno,sname,ssex,sage,sdept),其中sno为学号,sname为姓名,ssex为性别,sage为年龄,sdept为系别.查询女生平均年龄超过20岁的系别以及女生平均年龄.( )"]