方法一(效率底)
select A.* from 办卡 A where A.namedh not in (select namedh from 银行)
方法二(效率中)
select A.* from 办卡 A left join 银行 b on A.namedh=B.namedh where B.namedh is null
方法三(效率高)
select * from 办卡 A where (select count(1) as num from 银行 B where A.namedh = B.namedh) = 0