下列哪个查询语句属于列级子查询? A: select*fromstudentswhereage>(selectavg(age)fromstudents); B: selectnamefromclasseswhereidin(selectcls_idfromstudents); C: select*fromstudentswhere(heght,age)=(selectmax(heght),max(age)fromstudents);
下列哪个查询语句属于列级子查询? A: select*fromstudentswhereage>(selectavg(age)fromstudents); B: selectnamefromclasseswhereidin(selectcls_idfromstudents); C: select*fromstudentswhere(heght,age)=(selectmax(heght),max(age)fromstudents);
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