关于两个表的问题
有表A中一个字段DWDM(值:12 10 45 20)
有表B中一个字段DWDM(值:12 10 45 20 23 25)
DWDM是两表的主健
怎么样把B表的数据覆盖的A表中
[解决办法]
insert A
select * from B where DWDM not in (select DWDM from A)
[解决办法]
--maybe
update a set dwdm=b.dwdm from tablea a join tableb b on charindex(a.dwdm,b.dwdm)=1
[解决办法]
delete A
where DWDM not in (select DWDM from B)
[解决办法]
TRUNCATE table A
insert A select * from B
也可以..`
[解决办法]
你到现在还没有描述清楚两个表主键是关系?
[解决办法]
insert A
select * from B where DWDM not in (select DWDM from A)
[解决办法]
insert into A
select * from B where DWDM not in (select DWDM from A)
[解决办法]
create table A(DWDM int)
insert A select 12
union all select 10
union all select 45
union all select 20
go
create table B(DWDM int)
insert B select 12
union all select 10
union all select 45
union all select 20
union all select 23
union all select 25
go
insert A
select DWDM from B as tmp
where not exists(select 1 from A where DWDM=tmp.DWDM)
select * from A
