A.GROUP BY B.ORDER BY C.HAVING D.ASC
A.數(shù)據(jù)的一致性 B.數(shù)據(jù)的可靠性 C.數(shù)據(jù)的完整性 D.數(shù)據(jù)的安全性
A.ALTER TABLE B.MODIFY STRUCTURE C.MODIFY TABLE D.ALTER STRUCTURE