将一张表的字段更新到另一张表中

语法：

MySQL:

UPDATE a,b  
SET a.1=b.1  
WHERE a.2=b.2 

实例

update expense_voucher as ev,inventory as iv set ev.storage_time= iv.first_warehousing_time where ev.store_item_id = iv.id and ev.rksj is null

参考：

链接