select * from
(select id, xx, xx, xx, xx, xx, xx from a
union
select id, xx, xx, xx, xx, null, null from b
)
order by id
前提是每一列的类型相同
(select id, xx, xx, xx, xx, xx, xx from a
union
select id, xx, xx, xx, xx, null, null from b
)
order by id
前提是每一列的类型相同
解决方案 »
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