• 2022-06-07
    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);
  • 举一反三