A.STUDENT.DOC B.STUDENT.MEM C.STUDENT.DBT D.STUDENT.FPT
A.DO T1 B.RUN FORM1 T1 C.DO FORM T1 D.DO FROM T1
A.SELECT 年齡>50 FROM 職工 B.SELECT * FROM 職工 FOR 年齡>50 C.SELECT SUM(*) FROM 職工 WHERE 年齡>50 D.SELECT COUNT(*) FROM 職工 WHERE 年齡>50