如果由于 order by 子句中的 case 语句导致 SELECT DISTINCT 错误，则 ORDER BY 项目必须出现在选择列表中

Question

我在select中添加了按列排序，然后出现错误

如果SELECT DISTINCT由于order by子句中的case语句，ORDER BY项必须出现在选择列表中

这适用于 SQL Server 2012

DECLARE @SortType VARCHAR(20) = 'lUf'

SELECT DISTINCT
    COUNT(*) OVER () AS Count,      
    nm.NoteID, nm.Title, 
    Description, CreatedDate, Createddatetime, 
    nm.BusinessID, CreatedUser, nm.LastUpdatedDatetime 
FROM
    PLO.NotesMaster nm with(nolock) 
LEFT JOIN
    PLO.NoteTags nt ON nm.NoteID = nt.NoteID
WHERE 
    (nm.Title LIKE '%'+@keyword+'%'  OR COALESCE(@keyword ,'')='')
    AND (nt.TagID = @TagID OR COALESCE(@TagID, '') = '')
    AND (nm.BusinessID = @BusinessID)
    AND (nm.CreatedUser = @UserID)
    AND (nm.Status != 2)
ORDER BY
    Pinned DESC,
    (CASE @SortType
        WHEN 'lUf' THEN nm.LastUpdatedDatetime
     END) DESC,
    (CASE @SortType 
        WHEN 'lul' THEN nm.LastUpdatedDatetime
     END) ASC,
    (CASE @SortType 
        WHEN 'az' THEN nm.Title  
     END) ASC,
    (CASE @SortType 
        WHEN 'za' THEN nm.Title 
     END) desc

Answer 1

由于您将Select DISTINCT 和Order by 与Case 语句一起使用，因此您需要将所有带有case 语句的按列排序到您的select 语句中。

SELECT DISTINCT
    COUNT(*) OVER () AS Count,      
    nm.NoteID, nm.Title, 
    Description, CreatedDate, Createddatetime, 
    nm.BusinessID, CreatedUser, nm.LastUpdatedDatetime,
    Pinned DESC,
    (CASE @SortType
        WHEN 'lUf' THEN nm.LastUpdatedDatetime
     END) DESC,
    (CASE @SortType 
        WHEN 'lul' THEN nm.LastUpdatedDatetime
     END) ASC,
    (CASE @SortType 
        WHEN 'az' THEN nm.Title  
     END) ASC,
    (CASE @SortType 
        WHEN 'za' THEN nm.Title 
     END) desc
FROM
    PLO.NotesMaster nm with(nolock) 
LEFT JOIN
    PLO.NoteTags nt ON nm.NoteID = nt.NoteID
WHERE 
    (nm.Title LIKE '%'+@keyword+'%'  OR COALESCE(@keyword ,'')='')
    AND (nt.TagID = @TagID OR COALESCE(@TagID, '') = '')
    AND (nm.BusinessID = @BusinessID)
    AND (nm.CreatedUser = @UserID)
    AND (nm.Status != 2)
ORDER BY
    Pinned DESC,
    (CASE @SortType
        WHEN 'lUf' THEN nm.LastUpdatedDatetime
     END) DESC,
    (CASE @SortType 
        WHEN 'lul' THEN nm.LastUpdatedDatetime
     END) ASC,
    (CASE @SortType 
        WHEN 'az' THEN nm.Title  
     END) ASC,
    (CASE @SortType 
        WHEN 'za' THEN nm.Title 
     END) desc

或

SELECT * FROM
(
    SELECT DISTINCT
        COUNT(*) OVER () AS Count,      
        nm.NoteID, nm.Title, 
        Description, CreatedDate, Createddatetime, 
        nm.BusinessID, CreatedUser, nm.LastUpdatedDatetime 
    FROM
        PLO.NotesMaster nm with(nolock) 
    LEFT JOIN
        PLO.NoteTags nt ON nm.NoteID = nt.NoteID
    WHERE 
        (nm.Title LIKE '%'+@keyword+'%'  OR COALESCE(@keyword ,'')='')
        AND (nt.TagID = @TagID OR COALESCE(@TagID, '') = '')
        AND (nm.BusinessID = @BusinessID)
        AND (nm.CreatedUser = @UserID)
        AND (nm.Status != 2)
) t
ORDER BY
    Pinned DESC,
    (CASE @SortType
        WHEN 'lUf' THEN nm.LastUpdatedDatetime
     END) DESC,
    (CASE @SortType 
        WHEN 'lul' THEN nm.LastUpdatedDatetime
     END) ASC,
    (CASE @SortType 
        WHEN 'az' THEN nm.Title  
     END) ASC,
    (CASE @SortType 
        WHEN 'za' THEN nm.Title 
     END) desc

Answer 2

不，你没有：

我在select中添加了按列排序，然后出现错误

例如，您没有添加以下列：

CreatedUser BusinessID Description NoteID Createddatetime CreatedDate

您可以开始评论SELECT 中的列以查看查询何时开始工作。