把表BBB中的EE字段值是999， 更新等于为AAA表的EE字段值
条件是BBB表和AAA表的字段 CC 字段DD都相等

[此贴子已经被作者于2016-9-1 14:50编辑过]

update #表BBB set #表BBB.EE=#表AAA.EE from #表AAA where #表BBB.CC=#表AAA.CC and #表BBB.DD=#表AAA.DD and #表BBB.EE=999


drop table #表AAA
drop table #表bbb
GO

create table #表AAA(AA varchar(10),BB varchar(10),CC varchar(10),DD varchar(10),EE INT)
create table #表BBB(AA varchar(10),BB varchar(10),CC varchar(10),DD varchar(10),EE INT)


insert into #表BBB
select '0001','0011','0111','1111',999 union all
select '0002','0022','0222','2222',99 union all
select '0003','0033','0333','3333',999 union all
select '0004','0044','0444','4444',999

insert into #表AAA
select '0001','0011','0111','1111',1111 union all
select '0002','0022','0222','2222',2222 union all
select '0003','0033','0333','3333',3333 union all
select '0004','0044','4444','4444',4444

select * from #表bbb
update #表BBB set #表BBB.EE=#表AAA.EE from #表AAA where #表BBB.CC=#表AAA.CC and #表BBB.DD=#表AAA.DD and #表BBB.EE=999
select * from #表bbb

[此贴子已经被作者于2016-9-2 08:58编辑过]