单项选择题
A.select count（*）from teacher where tname like ’李%’；B.select count（*）from teacher where tname like ’%李’；C.select count（*）from teacher where trim（tname）=’李%’；D.select count（*）from teacher where trim（tname）like ’%李’；
A.dropB.changeC.modifyD.rename
A.select sex，count（*）from student group by sexB.select sex，sum（*）from student group by sexC.select sex，sum（sex）from student group by sexD.select sex，count（sex）from student order by sex