select * from
(select 序号,.... where 序号<=20) as a
left join
(select 序号,.... where 序号<=40 and 序号>20) as b
on a.序号+20 = b.序号我的思路,没经过测试
(select 序号,.... where 序号<=20) as a
left join
(select 序号,.... where 序号<=40 and 序号>20) as b
on a.序号+20 = b.序号我的思路,没经过测试
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