Sql 插入错误 - “子查询返回超过 1 个值”答案

【问题标题】：Sql Insert Error -"Subquery returned more than 1 value"Sql 插入错误 - “子查询返回超过 1 个值”
【发布时间】：2014-07-18 13:57:05
【问题描述】：

在下面的代码中，我将多个用逗号分隔的值传递给@i_CustomerGroupID，将一个值传递给@i_LocationID。在这个问题中，我遇到了一个问题“子查询返回了超过1 个值。当子查询跟随=，时，这是不允许的！ =、、>= 或当子查询用作表达式时。声明已终止。”。请帮我解决问题。

ALTER PROCEDURE [dbo].[spInsertCustomerGroupLocationMap]
    -- Add the parameters for the stored procedure here
    @i_LocationID int,
    @i_CustomerGroupID varchar(100)

    --WITH ENCRYPTION
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    -- Insert statements for procedure here
    IF NOT EXISTS (SELECT 1 FROM CustomerGroupLocationMap WHERE LocationID = @i_LocationID AND CustomerGroupID = @i_CustomerGroupID)
    BEGIN

        INSERT INTO CustomerGroupLocationMap (LocationID, CustomerGroupID) VALUES (@i_LocationID, (SELECT * FROM dbo.CSVToTable(@i_CustomerGroupID)));

    END
END

【问题讨论】：

标签： sql sql-server

【解决方案1】：

你想使用insert . . . select:

    INSERT INTO CustomerGroupLocationMap(LocationID, CustomerGroupID) 
        SELECT @i_LocationID, t.*
        FROM dbo.CSVToTable(@i_CustomerGroupID) t;

您的函数dbo.CSVToTable() 返回多个值（我假设只有一列）。正确的语法是insert . . . select。

请注意，insert . . . values 确实不需要。即使只有常量，也可以使用 insert . . . select。

【讨论】：

【解决方案2】：

IF NOT EXISTS (SELECT TOP 1 FROM CustomerGroupLocationMap WHERE LocationID = @i_LocationID AND CustomerGroupID = @i_CustomerGroupID)
BEGIN

    INSERT INTO CustomerGroupLocationMap (LocationID, CustomerGroupID) VALUES (@i_LocationID, (SELECT * FROM dbo.CSVToTable(@i_CustomerGroupID)));

END

【讨论】：

【解决方案3】：

您需要重写您的存在查询和插入查询-

IF NOT EXISTS (SELECT 1 FROM CustomerGroupLocationMap WHERE LocationID = @i_LocationID AND CustomerGroupID IN (SELECT *
    FROM dbo.CSVToTable(@i_CustomerGroupID) ))
BEGIN

    INSERT INTO CustomerGroupLocationMap (LocationID, CustomerGroupID) 
    SELECT @i_LocationID, i.* FROM dbo.CSVToTable(@i_CustomerGroupID) i;

END

【讨论】：