Question

我有一张购买表，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

另一个表 Credit_Customer ，如下所示：

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

我正在尝试创建一个交易来计算与月份相关的credit_customer购买（date_sold）

如果credit_customer购买＆lt; 12 /月，则允许插入其他回滚

Begin Transaction CC_Limit

    Alter Table Purchases
    ADD mon int

    Update Purchases
    Set mon = MONTH(date_sold)
    Where mon IS NULL

    Select Credit_Customer.Customer_Trn, Purchases.date_sold
    From Credit_Customer
    Inner Join Purchases
    On Credit_Customer.Customer_Trn=Purchases.Customer_Trn
    Order By Credit_Customer


    Declare @count int = (Select Count(*) from Credit_Customer)
    If @count<100

    Insert into Purchases (Chassis_Number,Customer_Trn,Purchase_ID,date_sold,selling_price,tax_amount)
        Values (@Chassis_Number,@Customer_Trn,@Purchase_ID,@date_sold,@selling_price,@tax_amount)


    Begin
    ROLLBACK trans

Answer 1

如果您希望获得一个月内交易次数少于12次的所有客户，我想您想做这样的事情：

SELECT Credit_Customer, COUNT(Credit_Customer.Customer_Trn) AS Cnt, YEAR(Purchases.date_sold) AS Yr, MONTH(Purchases.date_sold) AS Mon
FROM Credit_Customer 
Inner Join Purchases On Credit_Customer.Customer_Trn=Purchases.Customer_Trn 
GROUP BY Yr, Mon
HAVING COUNT(*) < 12
ORDER BY Credit_Customer

Answer 2

要检查信誉，您可以执行以下操作：

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

根据sql中的条件计算每月的值

2 个答案: