Question

我是SQL新手并尝试创建存储过程以了解参数和变量的工作原理。当我创建下面的存储过程时，我分配了2个参数和2个变量。我设置了变量的值。

创建存储过程但是当我将其作为

运行时

EXECUTE anniversary_file @year = 2017, @month = 3

我收到此错误：

Msg 512，Level 16，State 1，Procedure anniversary_file，Line 53
子查询返回的值超过1。当子查询遵循=，！=，＆lt;，＆lt; =，＆gt;，＆gt; =或子查询用作表达式时，不允许这样做。

我做错了什么？

这是我的代码：

CREATE PROCEDURE anniversary_file
    @year DATETIME,
    @month DATETIME
AS
BEGIN
    DECLARE @month1 AS DATETIME,
            @year1 AS DATETIME

    SET @month1 = (SELECT MONTH(C.OrderCompletionDate) FROM dbo.Customers AS   C)
    SET @year1 = (SELECT  YEAR(C.OrderCompletionDate) FROM dbo.Customers AS C)

    SELECT DISTINCT 
        CustomerID,
        BAN_ADSL_TN,
        LandlinePhoneNumber,
        MobilePhoneNumber,
        FirstName, LastName,
        ServiceAddress,
        ServiceAddressAptNo,
        ServiceAddressCity,
        ServiceAddressState,
        ServiceAddressZip,
        --MailingAddress,
        --MailingAddressAptNo,
        --MailingAddressCity,
        --MailingAddressState,
        --MailingAddressZip,
        --LanguageID,
        --OrderStatus,
        OrderCompletionDate 
    FROM 
        dbo.Customers AS C (NOLOCK)
    WHERE 
        StatusID = 115
        AND @year = @year1
        AND @month = @month1
END

Answer 1

在您的代码中，这些行是您的问题：

SET @month1 = (SELECT MONTH(C.OrderCompletionDate) FROM dbo.Customers AS C)
SET @year1 = (SELECT  YEAR(C.OrderCompletionDate) FROM dbo.Customers AS C)

如果您分别运行这些语句，您会注意到至少有一个语句返回多个值

SELECT MONTH(C.OrderCompletionDate) FROM dbo.Customers 
SELECT  YEAR(C.OrderCompletionDate) FROM dbo.Customers

因此，您尝试将结果设置插入到需要单个值的变量中。这可以通过几种方式纠正。

使用相应的TOP 1

添加ORDER BY

SET @month1 = (SELECT TOP 1 MONTH(C.OrderCompletionDate) FROM dbo.Customers AS C ORDER BY C.OrderCompletionDate DESC)
SET @year1 = (SELECT  TOP 1 YEAR(C.OrderCompletionDate) FROM dbo.Customers AS C ORDER BY C.OrderCompletionDate DESC)

添加WHERE条款......

SET @month1 = (SELECT MONTH(C.OrderCompletionDate) FROM dbo.Customers AS C WHERE <some clause to limit the result set>)
SET @year1 = (SELECT  YEAR(C.OrderCompletionDate) FROM dbo.Customers AS C WHERE <some clause to limit the result set>)

此外，您已将变量声明为DATETIME但传入INTEGER

DECLARE @month1 AS DATETIME
DECLARE @year1 AS DATETIME

这些应该是INT，因为MONTH()和YEAR()会返回INTEGER。

最后，您的程序可能不会按照您的想法执行。您可以简化代码并在WHERE子句中使用它。

WHERE StatusID = 115
AND year(OrderCompletionDate) = year(@year)
AND month(OrderCompletionDate)= month(@month)

此外，当您可以使用DATETIME然后不在INTEGER子句中使用强制转换时，将@year和@month参数声明为WHERE。

Answer 2

无需设置变量。试试这个。删除您正在设置的变量并更新 Where 子句。

＆＃xA;＆＃xA;

将输入变量声明为INT。

＆＃ xA;＆＃xA;

更新

＆＃xA;＆＃xA;

  CREATE PROCEDURE anniversary_file＆＃xA; @year INT，＆＃xA; @month INT＆＃xA;＆＃xA; AS＆＃XA;开始＆＃xA;＆＃xA; ******删除这些线路＆＃xA;＆＃xA; DECLARE @ month1 AS DATETIME，＆＃xA; @ year1 AS DATETIME＆＃xA;＆＃xA;＆＃xA; SET @ month1 =（SELECT MONTH（C.OrderCompletionDate）FROM dbo.Customers AS C）＆＃xA; SET @ year1 =（SELECT YEAR（C.OrderCompletionDate）FROM dbo.Customers AS C）＆＃xA; *************************＆＃xA; SELECT DISTINCT＆＃xA;客户ID，＆＃XA; BAN_ADSL_TN，＆＃XA; LandlinePhoneNumber，＆＃XA; MobilePhoneNumber，＆＃XA;名字，＆＃XA;姓氏，＆＃XA; ServiceAddress，＆＃XA; ServiceAddressAptNo，＆＃XA; ServiceAddressCity，＆＃XA; ServiceAddressState，＆＃XA; ServiceAddressZip，＆＃XA; --MailingAddress，＆＃XA; --MailingAddressAptNo，＆＃XA; --MailingAddressCity，＆＃XA; --MailingAddressState，＆＃XA; --MailingAddressZip，＆＃XA; --LanguageID，＆＃XA; --OrderStatus，＆＃XA; OrderCompletionDate＆＃xA;来自dbo.Customers AS C（NOLOCK）＆＃xA; WHERE StatusID = 115＆＃xA; AND @year = YEAR（C.OrderCompletionDate）＆＃xA; AND @month = MONTH（C.OrderCompletionDate）＆＃xA;＆＃xA; END＆＃XA;

＆＃XA;

我的SQL Server存储过程出错

2 个答案: