Question

我已经创建了一个用于填充下拉列表的存储过程。但是order by子句对我的过程不起作用。

ALTER PROCEDURE proc
    -- Add the parameters for the stored procedure here
    @compID bigint,
    @after datetime
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    CREATE TABLE #tmpAuc ( ProjectID BIGINT, Title VARCHAR(256))
    INSERT INTO #tmpAuc
    SELECT SA.ID ProjectID, SA.Title 
    FROM [dbo].[Sessions] S
        INNER JOIN Auc SA ON S.AucID = SA.ID
    WHERE S.Session < 3 AND SA.Status > 0 AND SA.CompanyID = @companyID AND S.LiveBeginDate > @after
    ORDER BY LiveBeginDate

    SELECT DISTINCT * FROM #tmpAuc
END

我想按LiveBehinDate的降序顺序

Answer 1

在临时表中以及临时表结果LiveBeginDate中包含ORDER BY LiveBeginDate

CREATE TABLE #tmpAuctions (ProjectID BIGINT, Title VARCHAR(256), LiveBeginDate DATETIME)
INSERT INTO #tmpAuctions (ProjectID, Title, LiveBeginDate)
SELECT SA.ID AS ProjectID, SA.Title, S.LiveBeginDate
FROM [dbo].[Sessions] S
INNER JOIN [Spectrum_Auctions].[dbo].[Auctions] SA ON S.AuctionID = SA.ID
WHERE S.SessionState < 3 AND SA.Status > 0 AND SA.CompanyID = @companyID AND S.LiveBeginDate > @after

SELECT DISTINCT * 
FROM #tmpAuctions
ORDER BY LiveBeginDate

或避免使用临时表，并直接在过程内使用带有JOIN的SELECT：

SELECT SA.ID AS ProjectID, SA.Title
FROM [dbo].[Sessions] S
INNER JOIN [Spectrum_Auctions].[dbo].[Auctions] SA ON S.AuctionID = SA.ID
WHERE S.SessionState < 3 AND SA.Status > 0 AND SA.CompanyID = @companyID AND S.LiveBeginDate > @after
ORDER BY S.LiveBeginDate

Answer 2

这是因为在写入驻留在temp dB中的temp表时，数据是有序的。永远不能保证从temp dB读取数据。因此，当您从临时表中选择星号时，您将获得。摆脱临时表并直接进行选择。这也将更快，更高效。如果您的proc变得更加复杂，请使用CTE而不是临时表，因为它们在所有情况下都更易于概念化且运行速度更快。

内在的顺序和顺序加入

2 个答案: