如何为Union结果添加订单？

Question

在SQL Server 2008中,我们可以使用Union/Unino All将两个结果放在一起,但我想为最终结果添加order by.怎么办？

我想要的是:

select id1 as id, * from ...
Union All
select id2 as id, * from ...
order by id

请帮忙.谢谢.

Answer 1

如评论中所述,您给出的伪代码应该有效,将顺序应用于组合结果集.如果您尝试以两种结果集保持不同的方式进行排序,则需要引入人工排序列,例如:

select id1 as id, *, 1 as MySortKey from ...
Union All
select id2 as id, *, 2 as MySortKey from ...
order by MySortKey, id