ORDER BY CASE WHEN 不能用于 COUNT() AS Foo 结果列？

Question

我有一个查询，我试图允许基于 C# SQL 服务器客户端库传入的参数进行排序。我的查询目前看起来像这样...

SELECT d.OpinionDocumentId,
       d.DisplayTitle, 
       d.Court,
       d.State,
       d.Date,
       (SELECT i.Identifier + ', '
        FROM dbo.OpinionDocumentCitationIdentifiers i
        WHERE i.OpinionDocument_OpinionDocumentId = b.OpinionDocument_OpinionDocumentId
        FOR XML PATH('')) AS Identifiers,
       COUNT(DISTINCT c.OpinionDocument_OpinionDocumentId1) AS CitationCount,
       COUNT(DISTINCT t.OpinionDocument_OpinionDocumentId) AS CitedByCount

FROM dbo.OpinionDocumentBookmarks b

INNER JOIN dbo.OpinionDocuments d ON d.OpinionDocumentId = b.OpinionDocument_OpinionDocumentId
LEFT JOIN dbo.OpinionDocumentOpinionDocuments c ON c.OpinionDocument_OpinionDocumentId = b.OpinionDocument_OpinionDocumentId
LEFT JOIN dbo.OpinionDocumentOpinionDocuments t ON t.OpinionDocument_OpinionDocumentId1 = b.OpinionDocument_OpinionDocumentId

WHERE b.Account_AccountId = @accountId

GROUP BY b.OpinionDocumentBookmarkId,
       b.OpinionDocument_OpinionDocumentId,
       d.OpinionDocumentId,
       d.DisplayTitle,
       d.Court,
       d.State,
       d.Date

ORDER BY CASE WHEN @sort = 'DisplayTitle' THEN d.DisplayTitle END,
       CASE WHEN @sort = 'Date' THEN d.Date END,
       CASE WHEN @sort = 'Court' THEN d.Court END,
       CASE WHEN @sort = 'State' THEN d.State END,
       CASE WHEN @sort = 'Citations' THEN CitationCount END

OFFSET @skip ROWS FETCH NEXT @take ROWS ONLY

如您所见，我试图允许基于参数进行排序。我正在尝试允许对聚合的 CitationCount 或 CitedByCount 列进行排序。当我不使用 ORDER BY CASE WHEN 时，我可以按这些列排序，但是当我尝试将其指定为 ORDER BY CASE WHEN 中的列时，我收到一条错误消息，提示它不是一列。

这可能吗？

Answer 1

SELECT *
FROM
    (
    SELECT
        d.OpinionDocumentId
        , d.DisplayTitle
        , d.Court
        , d.[State]
        , d.[Date]
        , (
            SELECT i.Identifier + ', '
            FROM dbo.OpinionDocumentCitationIdentifiers AS i
            WHERE i.OpinionDocument_OpinionDocumentId = b.OpinionDocument_OpinionDocumentId
            FOR XML PATH('')
        ) AS Identifiers
        , COUNT(DISTINCT c.OpinionDocument_OpinionDocumentId1) AS CitationCount
        , COUNT(DISTINCT t.OpinionDocument_OpinionDocumentId) AS CitedByCount
    FROM
        dbo.OpinionDocumentBookmarks AS b
        INNER JOIN dbo.OpinionDocuments AS d
            ON d.OpinionDocumentId = b.OpinionDocument_OpinionDocumentId
        LEFT JOIN dbo.OpinionDocumentOpinionDocuments AS c
            ON c.OpinionDocument_OpinionDocumentId = b.OpinionDocument_OpinionDocumentId
        LEFT JOIN dbo.OpinionDocumentOpinionDocuments AS t
            ON t.OpinionDocument_OpinionDocumentId1 = b.OpinionDocument_OpinionDocumentId
    WHERE b.Account_AccountId = @accountId
    GROUP BY
        b.OpinionDocumentBookmarkId
        , b.OpinionDocument_OpinionDocumentId
        , d.OpinionDocumentId
        , d.DisplayTitle
        , d.Court
        , d.State
        , d.Dat
    ) AS H
ORDER BY
    CASE WHEN @sort = 'DisplayTitle' THEN DisplayTitle END,
    CASE WHEN @sort = 'Date' THEN [Date] END,
    CASE WHEN @sort = 'Court' THEN Court END,
    CASE WHEN @sort = 'State' THEN [State] END,
    CASE WHEN @sort = 'Citations' THEN CitationCount END

ORDER BY CASE WHEN 不能用于 COUNT() AS Foo 结果列？

ORDER BY CASE WHEN can't be used on an COUNT() AS Foo result column?

sql

tsql

sql-server