第Ⅳ4章关系数据库标准语言S2 THERE Join Condition ANd Join Condition JIAND OR FilterCondition.I IGROUP BY Group Column Group Column.I THAVING FilterCondition IUNION ALLI SELECTCommand TORDER BY Order Item [ASC DESC]L Order Item [ASC|DESC]…]第14章 关系数据库标准语言SQL [WHERE JoinCondition [AND JoinCondition ...][AND | OR FilterCondition...]] [GROUP BY GroupColumn [, GroupColumn ...]] [HAVING FilterCondition] [UNION [ALL] SELECTCommand] [ORDER BY Order_Item [ASC | DESC] [, Order_Item [ASC | DESC] ...]]