sql - 如果指定了 SELECT DISTINCT 错误，则 ORDER BY 项目必须出现在选择列表中

Question

我需要以某种方式列出一个字段，但对它进行不同的排序。这是查询。有什么办法吗？

SELECT DISTINCT tsgroup
FROM   master
ORDER  BY RIGHT(RTRIM(tsgroup), 3),
          LEFT(rtrim(tsgroup), 3) 

Answer 1

您可以GROUP BY 改用

SELECT tsgroup
FROM   master
GROUP  BY tsgroup
ORDER  BY RIGHT(RTRIM(tsgroup), 3),
          LEFT(RTRIM(tsgroup), 3) 

Answer 2

就像一个黑客：

select grp from (
select distinct tsgroup as grp
from master 
)
order by RIGHT(RTRIM(grp), 3) , left(rtrim(grp), 3)