[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fXiDiOJsVqzDdeSm2agqsvJMV5stlpRJxDYcmsQEWgOU":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":16,"related":17,"source":27,"type":28},[],"2023-12-06 17:35:28",111240693,[8,9,10,11],"关键字DESC表示升序,ASC表示降序","如果指定多列排序,可以在任意列使用升序或降序关键字","关键字ASC表示降序,DESC表示升序","关键字DESC表示升序,ASC表示分组",{"courseId":13,"courseImg":14,"courseName":15},"e8a517cbead618ad18d52d8244f8afad","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F25b30343053994e8940089572d36015b.jpg","数据库技术基础","关于检索结果排序,正确的是",[18,29,38,47,54,63,72,81,91,94],{"answer":19,"createTime":20,"id":21,"options":22,"question":26,"source":27,"type":28},[],"2023-12-06 17:35:27",111240679,[23,24,25],"对","不确定","错","由于索引可以提高对表的查询速度,因此,在表上建立的索引越多越好","v1",0,{"answer":30,"createTime":20,"id":31,"options":32,"question":37,"source":27,"type":28},[],111240680,[33,34,35,36],"CHECK","UNIQUE","NOT NULL","DEFAULT","在MySQL中,非空约束可以通过( )关键字定义",{"answer":39,"createTime":20,"id":40,"options":41,"question":46,"source":27,"type":28},[],111240683,[42,43,44,45],"DROP DATABASE","CREATE TABLE","DROP TABLE","ALERT TABLE","想要删除数据库中已经存在的数据表,可以使用( )语句",{"answer":48,"createTime":20,"id":49,"options":50,"question":53,"source":27,"type":28},[],111240685,[35,51,52,36],"TEMPORARY","IF NOT EXISTS","创建数据表时,使用( )关键字表示创建临时表",{"answer":55,"createTime":20,"id":56,"options":57,"question":62,"source":27,"type":28},[],111240686,[58,59,60,61],"保证各行在该索引上的值不能为NULL","保证各行在该索引上的值都不能重复","保证参加唯一索引的各列,不能再参加其他的索引","保证唯一索引不能被删除","UNIQUE唯一索引的作用是( )",{"answer":64,"createTime":20,"id":65,"options":66,"question":71,"source":27,"type":28},[],111240687,[67,68,69,70],"ALTER TABLE table_name DROP COLUMN","ALTER TABLE table_name DROP column_name","ALTER TABLE table_name DROP COLUMN column_name","ALTER table_name DROP COLUMN column_name","以下能够删除一列的是( )",{"answer":73,"createTime":20,"id":74,"options":75,"question":80,"source":27,"type":28},[],111240688,[76,77,78,79],"GROUP BY 子句用来分组where子句的输出","聚合函数需要和group by一起使用","HAVING子句用来从FROM的结果中筛选行","having子句用来分组where子句的输出","下列说法错误的是",{"answer":82,"createTime":83,"id":84,"options":85,"question":90,"source":27,"type":28},[],"2023-12-05 20:44:36",111240690,[86,87,88,89],"INT","SET","VARCHAR","CHAR","下列哪些类型是数值类型的数据",{"answer":92,"createTime":5,"id":6,"options":93,"question":16,"source":27,"type":28},[],[8,9,10,11],{"answer":95,"createTime":96,"id":97,"options":98,"question":103,"source":27,"type":28},[],"2023-12-06 16:25:42",111240699,[99,100,101,102],"SAGE NOT&lt;20 and CNAME in('ACCESS')","S#=SC.S# and C.C#= SC.C# and SAGE&gt;=20 and CNAME='ACCESS'","SAGE &gt;=20 and CNAME ='ACCESS'","SAGE&gt;=20 and CNAME='ACCESS'","有关系S(S#,SNAME,SAGE),C(C#,CNAME),SC(S#,C#,GRADE).其中S#是学生号,SNAME是学生姓名,SAGE是学生年龄,C#是课程号,CNAME是课程名称.要查询选修&quot;ACCESS&quot;课的年龄不小于20的全体学生姓名的SQL语句是SELECT SNAME FROM S,C,SC WHERE、子句.这里的WHERE子句的内容是( )"]