A表
c1 c2
--------------
1 a1
2 a2
3 a3
8 a8
B表
c1 c3
--------------
1 b1
2 b1
3 b3
10 b10
A.c1與B.c1相等,用一條sql語句,實現A.c2的值更新爲B.c3
------------------------
MSS:
SET A.c2 =B.c3
from A ,B
where A.c1=B.c1
UPDATE A
SET A.c2 =B.c3
from A inner join B on A.c1=B.c1
注意:update後面是不能跟多表的,但跟在from子句後面
ORA:
update A
set (A.c2) = (select B.c3 FROM B where A.c1=B.c1)