Sql server sp错误：子查询返回的值超过1

下面是存储过程

ALTER PROCEDURE [dbo].[spGetMarkdownPlan]
    @MarkdownPlanDate   VARCHAR(10),
    @Memo               VARCHAR(100)

AS
SET NOCOUNT ON;
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;

DECLARE @ItemType   VARCHAR(4)
SET @ItemType = (SELECT ItemType FROM tblMarkDownPlan 
            WHERE   MarkdownPlanDate    >= CONVERT(SMALLDATETIME, @MarkdownPlanDate)
                AND MarkdownPlanDate    < CONVERT(SMALLDATETIME, @MarkdownPlanDate) + 1
                AND Memo = @Memo);

BEGIN
IF @ItemType = '0010' -- itemcode
BEGIN
    SELECT  mdp.Itemcode,
            SectionCode,
            ColorID ='',
            SizeDCode ='',
            CurrentPrice,       
            MarkDownPrice

FROM  tblMarkDownPlan mdp LEFT OUTER JOIN tblMarkDownPlanSection mdps ON (mdp.MarkdownPlanDate = mdps.MarkdownPlanDate AND mdp.Itemcode = mdps.Itemcode AND mdp.Memo = mdps.Memo)
WHERE   mdp.MarkdownPlanDate        >= CONVERT(SMALLDATETIME, @MarkdownPlanDate)
        AND mdp.MarkdownPlanDate            < CONVERT(SMALLDATETIME, @MarkdownPlanDate) + 1
        AND mdp.Memo                = @Memo 
        AND mdp.ItemType = '0010'       
END
ELSE  

SELECT  mdp.Itemcode,
        SectionCode,
        ColorID ,
        SizeDCode ,
        CurrentPrice,       
        MarkDownPrice

FROM    tblMarkDownPlan mdp LEFT OUTER JOIN tblMarkDownPlanSectionSKU mdpsku ON (mdp.MarkdownPlanDate = mdpsku.MarkdownPlanDate AND mdp.Itemcode = mdpsku.Itemcode AND mdp.Memo = mdpsku.Memo)
WHERE   mdp.MarkdownPlanDate        >= CONVERT(SMALLDATETIME, @MarkdownPlanDate)
        AND mdp.MarkdownPlanDate    < CONVERT(SMALLDATETIME, @MarkdownPlanDate) + 1
        AND mdp.Memo                = @Memo
        AND mdp.ItemType != '0010'

END

子查询返回了多个值。当子查询在=、！=、=或者当子查询用作表达式时

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您有什么好主意吗？

只有一个子查询，因此该子查询返回多个项

您可以通过获取第一个项目轻松解决此问题：

SET @ItemType = (SELECT TOP 1 ItemType ...

---

但是，您应该考虑为什么子查询返回不止一个项，并且它返回正确的项。

< P>您可以尝试这种方式-< /P>

ALTER PROCEDURE [dbo].[spGetMarkdownPlan]
    @MarkdownPlanDate   VARCHAR(10),
    @Memo               VARCHAR(100)

AS
SET NOCOUNT ON;
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;

--DECLARE @ItemType   VARCHAR(4)
IF OBJECT_ID('tempdb..#ItemType') IS NOT NULL
DROP TABLE #ItemType

CREATE TABLE #ItemType (ItemType VARCHAR(4));

INSERT INTO #ItemType 
SELECT ItemType FROM tblMarkDownPlan 
            WHERE   MarkdownPlanDate    >= CONVERT(SMALLDATETIME, @MarkdownPlanDate)
                AND MarkdownPlanDate    < CONVERT(SMALLDATETIME, @MarkdownPlanDate) + 1
                AND Memo = @Memo;

BEGIN
--IF @ItemType = '0010' -- itemcode
IF EXISTS (SELECT 1 FROM #ItemType WHERE ItemType = '0010') -- itemcode
BEGIN
    SELECT  mdp.Itemcode,
            SectionCode,
            ColorID ='',
            SizeDCode ='',
            CurrentPrice,       
            MarkDownPrice

FROM  tblMarkDownPlan mdp LEFT OUTER JOIN tblMarkDownPlanSection mdps ON (mdp.MarkdownPlanDate = mdps.MarkdownPlanDate AND mdp.Itemcode = mdps.Itemcode AND mdp.Memo = mdps.Memo)
WHERE   mdp.MarkdownPlanDate        >= CONVERT(SMALLDATETIME, @MarkdownPlanDate)
        AND mdp.MarkdownPlanDate            < CONVERT(SMALLDATETIME, @MarkdownPlanDate) + 1
        AND mdp.Memo                = @Memo 
        AND mdp.ItemType = '0010'       
END
ELSE  

SELECT  mdp.Itemcode,
        SectionCode,
        ColorID ,
        SizeDCode ,
        CurrentPrice,       
        MarkDownPrice

FROM    tblMarkDownPlan mdp LEFT OUTER JOIN tblMarkDownPlanSectionSKU mdpsku ON (mdp.MarkdownPlanDate = mdpsku.MarkdownPlanDate AND mdp.Itemcode = mdpsku.Itemcode AND mdp.Memo = mdpsku.Memo)
WHERE   mdp.MarkdownPlanDate        >= CONVERT(SMALLDATETIME, @MarkdownPlanDate)
        AND mdp.MarkdownPlanDate    < CONVERT(SMALLDATETIME, @MarkdownPlanDate) + 1
        AND mdp.Memo                = @Memo
        AND mdp.ItemType != '0010'

IF OBJECT_ID('tempdb..#ItemType') IS NOT NULL
DROP TABLE #ItemType

END

---

从tblMarkDownPlan中选择ItemType，而不是使用从tblMarkDownPlan中选择top 1 ItemType可能与@gitstar重复：然后您必须重写代码。不能在varchar值中存储多个值。如果你想循环多个项目类型，你可以使用一个表变量。先生，对不起，你能给我写一个简单的示例吗？@gitstar：你想用不同的值做什么？