可以利用一下select max(字段) from 表 这种形式。Select max(num) from
(
Select n1 as num
union all
Select n2 as num
union all
Select n3 as num
union all
Select n4 as num
...
) temp
(
Select n1 as num
union all
Select n2 as num
union all
Select n3 as num
union all
Select n4 as num
...
) temp
解决方案 »
免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货