A.DATEDIFF() B.DATE_FORMAT() C.DAY() D.CURDATE()
A.ORDER BY CLASSES B.DORDER CLASSES C.GROUP BY CLASSES D.GROUP CLASSES
A.刪除當前數(shù)據(jù)庫中整個employee表,包括表結構 B.刪除當前數(shù)據(jù)庫中employee表內的所有行 C.由于沒有where子句,因此不刪除任何數(shù)據(jù) D.刪除當前數(shù)據(jù)庫中employee表內的當前行