--<2>使用子查询实现 SELECT( --这里返回多个结果 SELECT DName FROM hos_district WHERE DID IN( SELECT SDID FROM hos_street WHERE SID IN( SELECT SID FROM hos_house WHERE UID=( SELECT UID FROM sys_user WHERE UName='小李' ) ) ) ) 区县,( SELECT SName FROM hos_street WHERE SID IN( SELECT SID FROM hos_house WHERE UID=( SELECT UID FROM sys_user WHERE UName='小李' ) ) ) 街道,HTID 户型,PRICE 价格,TOPIC 标题,CONTENTS 描述,HTIME 时间,COPY 备注 FROM hos_house WHERE UID=( SELECT UID FROM sys_user WHERE UName='小李' )