标签：from red ediff 之间 nbsp date ted select sel
select datediff(ward_hd,allen_hd)
from (
select hiredate as ward_hd
from emp
where ename=‘WARD‘
) x,
(select hiredate as allen_hd
from emp
where ename=‘ALLEN‘
)y;
标签：from red ediff 之间 nbsp date ted select sel
原文地址：http://www.cnblogs.com/liang545621/p/7523295.html
