基于sql中的条件的每月计数值

我有一张购买清单，如下所示：

Chassis_Number  Customer_Trn  Purchase_ID  date_sold  selling_price  tax_amount
-------------------------------------------------------------------------------
1234            567           1234567      2012-1-23  2345653        12343
2345            678           2345678      2013-4-05  1089255        11332

Customer_Trn  Repayment  Monthly_Payment
----------------------------------------
567           456530     4530

CREATE PROCEDURE GetCreditWorthiness 
    @Customer_Trn int 
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    DECLARE isCreditWorthy bit = 0
    DECLARE @Yr = YEAR(getdate())
    DECLARE @Mon = MONTH(getdate())

    SELECT @isCreditWorthy = CASE WHEN COUNT(Credit_Customer.Customer_Trn) < 12 THEN 1 ELSE 0 END
    FROM Credit_Customer 
        INNER JOIN Purchases On Credit_Customer.Customer_Trn=Purchases.Customer_Trn 
    WHERE Credit_Customer.Customer_Trn = @Customer_Trn 
        AND MONTH(date_sold) = @Mon and YEAR(date_sold) = @Yr    

    RETURN @isCreditWorthy
END

另一个表Credit_客户如下所示：

Chassis_Number  Customer_Trn  Purchase_ID  date_sold  selling_price  tax_amount
-------------------------------------------------------------------------------
1234            567           1234567      2012-1-23  2345653        12343
2345            678           2345678      2013-4-05  1089255        11332

Customer_Trn  Repayment  Monthly_Payment
----------------------------------------
567           456530     4530

CREATE PROCEDURE GetCreditWorthiness 
    @Customer_Trn int 
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    DECLARE isCreditWorthy bit = 0
    DECLARE @Yr = YEAR(getdate())
    DECLARE @Mon = MONTH(getdate())

    SELECT @isCreditWorthy = CASE WHEN COUNT(Credit_Customer.Customer_Trn) < 12 THEN 1 ELSE 0 END
    FROM Credit_Customer 
        INNER JOIN Purchases On Credit_Customer.Customer_Trn=Purchases.Customer_Trn 
    WHERE Credit_Customer.Customer_Trn = @Customer_Trn 
        AND MONTH(date_sold) = @Mon and YEAR(date_sold) = @Yr    

    RETURN @isCreditWorthy
END

我正在尝试创建一个交易，该交易统计客户购买monthdate的金额与已售出monthdate的金额

---

如果credit_客户购买我认为，如果您希望获得所有一个月内交易少于12笔的客户，您应该这样做：

选择Credit_Customer，COUNTCredit_Customer.Customer_Trn AS Cnt，YEARPurchases.date_sall AS Yr，MONTHPurchases.date_sall AS Mon 来自信用卡客户 内部加入赊购\u客户。客户\u Trn=Purchases.Customer\u Trn 按年份分组，周一 计数*小于12的 按信用证客户订购

---

要检查信用度，您可以执行以下操作：

Chassis_Number  Customer_Trn  Purchase_ID  date_sold  selling_price  tax_amount
-------------------------------------------------------------------------------
1234            567           1234567      2012-1-23  2345653        12343
2345            678           2345678      2013-4-05  1089255        11332

Customer_Trn  Repayment  Monthly_Payment
----------------------------------------
567           456530     4530

CREATE PROCEDURE GetCreditWorthiness 
    @Customer_Trn int 
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    DECLARE isCreditWorthy bit = 0
    DECLARE @Yr = YEAR(getdate())
    DECLARE @Mon = MONTH(getdate())

    SELECT @isCreditWorthy = CASE WHEN COUNT(Credit_Customer.Customer_Trn) < 12 THEN 1 ELSE 0 END
    FROM Credit_Customer 
        INNER JOIN Purchases On Credit_Customer.Customer_Trn=Purchases.Customer_Trn 
    WHERE Credit_Customer.Customer_Trn = @Customer_Trn 
        AND MONTH(date_sold) = @Mon and YEAR(date_sold) = @Yr    

    RETURN @isCreditWorthy
END

---

您的问题是什么？我如何使用交易来完成业务规则：信用购买每月不得超过12次您的代码有什么问题？代码没有按预期工作；应该进行回滚，以防止在特定月份赊购12辆以上的车辆。我正在销售车辆。我不想赊销我所有的车。我赊销的车辆数量必须有一个限制。我想把这个月的限额加进去。回滚应该发生，以防止在特定月份赊购12辆以上的车辆。我将编写另一个存储过程，并让您的应用程序调用它来检查信用度。你可以进行另一次检查，防止插入，但前端应该处理这个。我是一个在编码SP和传输的初学者。。。我将代码放在if语句中，但它不起作用。是否可以将if与上述代码一起使用？怎么做？这个答案很有用。。。现在，我是要写入另一个sp并将事务块放在那里，还是可以立即将事务块放在后面？