union all拼接排序后的结果集

遇到一个问题: union all拼接排序后的结果集时会出现最后拼接的结果集排序不起做用spa         select * from ( select *, '1' as type from ( select * from wp_project where project_type = '大型项目' union all select * from wp_project where 1=0 )

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