用表B的数据(mc列)更新表A的mc列
update A SET A.mc = b.mc FROM A ,B WHERE A.bmbh = B.bmbh and A.xmbh = B.xmbh;
update A, B set A.mc = B.mc where A.bmbh = B.bmbh and A.xmbh = B.xmbh;
或
update A INNER JOIN B ON A.bmbh = B.bmbh AND A.xmbh = B.xmbh SET A.mc = B.mc;
SQL Update:使用一个表的数据更新另一张表,布布扣,bubuko.com
原文:http://www.cnblogs.com/rainman/p/3584005.html