内部加入 order by 和 where 子句

Question

我创建了一个用于填充下拉列表的存储过程。但是 order by 子句不适用于我的程序。

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 降序排列

Answer 1

在临时 table 和临时 table 结果中包含 LiveBeginDate 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 temp table 并直接在过程中使用 SELECT 和 JOIN:

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

那是因为您的数据在写入驻留在 temp dB 中的 temp table 时是有序的。永远不能保证从 temp dB 读取是有序的。因此，当您 select 从您的温度 table 中加星时，这就是您得到的。摆脱临时 table 并直接执行 select。这也将更快、更有效。如果您的过程变得更复杂，请使用 CTE 而不是临时 tables，因为它们更容易概念化并且运行在所有情况下都快得多。

内部加入 order by 和 where 子句

Inner Join with order by and where clase

sql

sql-server

join

inner-join

sql-query-store