A.使用group by進行分組查詢 B.對分組后的條件的篩選必須使用Having子句 C.Having子句不能與where子句同時出現(xiàn)在一個select語句中 D.在使用分組查詢時,在select列表中只能出現(xiàn)被分組的列。如:select courseid from grade group by courseid
A.OR B.Notbetween C.NotIN D.Like
A.select dateadd(mm,4,’01/01/1999’)返回值為:05/01/99 B.select datediff(mm,’03/06/2003’,’03/09/2003’)返回值為:3 C.select datepart(day,’03/06/2003’)返回值為:6 D.select datename(dw,’03/06/2003’)返回值為:6