UPDATE A,B SET A.a=B.a where A.c=B.c;
A和B为表,a,c为字段,格式你再调下
UPDATE ATable
SET (ATable.A) = (
SELECT (BTable.A)
FROM BTable
WHERE ATable.C = BTable.C)
update a set a.a=b.a
from a ,b
where a.c = b.c
update 表A,表B set 表A.A=表B.A where 表A.C=表B.C
update 表A,表B set 表A.A=表B.A where 表A.C=表B.C
应该是这样写