Update Table1 set Field1=(select New from table2,table1 where table2.old=table1.field1)
我的意思是把table1.field1的值按照table2的新旧对应关系更新
update table1 set field1 = (select b.new from table1 a,table2 b
where b.old = a.field1)
Update Table1 a set Field1=(select New from table2 b where b.old=a.field1)