select语句应为:select ColumnA as ColumnAC, ColumnB, null as ColumnD from 表1
union
select ColumnC as ColumnAC, null as ColumnB, ColumnD from 表2
order by ColumnAC
union
select ColumnC as ColumnAC, null as ColumnB, ColumnD from 表2
order by ColumnAC
解决方案 »
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