sql 记录

 

 

INSERT INTO B([name],[info]) SELECT [name,'10'] FROM A

 

级联更新1：
update tb1,
tb2
set tb1.a=tb2.a,tb1.b=tb2.b
where tb1.id=tb2.id

级联更新2：

update tb1,
(select * from tb2) as tb2
set tb1.a=tb2.a,tb1.b=tb2.b
where tb1.id=tb2.id

级联更新3：

update (select * from tb1 group by C) as temp,
       tb2,
       tb1
set tb1.a = tb2.a,
    tb1.b = tb2.b
where tb1.id = tb2.id and
      temp.id = tb2.id

级联更新4：

update tb1 left join tb2 on tb1.id = tb2.id
set tb1.a = tb2.a,
    tb1.b = tb2.b
where ......