ORDER BY CASE WHEN：ORDER BY 项目必须出现在选择列表中

Question

我有这个我正在尝试运行的示例代码。只有表名和列名被更改。我想要做的是有一个状态的结果集，并将“NULL”作为第一个值，其余的结果按升序显示在“NULL”下面，我一辈子都不能让它工作。我在底部得到错误。这可能是一个非常“愚蠢”的问题，但有人可以帮忙吗？非常感谢大家！

SELECT  DISTINCT
    State
FROM    TABLE1 (NOLOCK)
WHERE   COLUMN1 NOT LIKE '%THAT%'
    AND COLUMN1 NOT LIKE '%THIS%'
UNION
SELECT  'NULL'
ORDER BY ( CASE WHEN State = 'NULL' THEN 0
            ELSE 1
       END );   

错误信息：

ORDER BY items must appear in the select list if the statement contains a UNION, INTERSECT or EXCEPT operator.

Answer 1

您需要选择该列...即使您以后不使用它，order by 也要求它出现在选择中。

SELECT  DISTINCT
    State,
 CASE WHEN State = 'NULL' THEN 0
            ELSE 1 END orderId
FROM    TABLE1 (NOLOCK)
WHERE   COLUMN1 NOT LIKE '%THAT%'
    AND COLUMN1 NOT LIKE '%THIS%'
ORDER BY ( CASE WHEN State = 'NULL' THEN 0
            ELSE 1
       END );