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select
*,
(select min(t.a)
from
(select 字段1 as a
union select 字段2
union select 字段3
union select 字段4
union select 字段5
) t
) as [最小日期]
from
表
select
*
(select min(t.a) from (select 字段1 as a union select 字段2 union select 字段3 union select 字段4 union select 字段5) t) as [最小日期]
from
表