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如何在 SQL 服务器存储过程中将当前月份作为参数传递给前一个月的总数?

[英]How to get the total of a previous month having passed the current month as a parameter in a SQL Server stored procedure?

Through the following query, I am able to get the total for the current month from a data.table.通过以下查询,我能够从 data.table 中获取当月的总数。

SELECT SUM(MONTODEBITO) - SUM(MONTOCREDITO)
FROM PRUEBAOPEX
WHERE MONTH(FECHA) = 1 AND YEAR(FECHA) = 2021

Since I am working inside a stored procedure, I have declared a variable that is equal to the following query.因为我在存储过程中工作,所以我声明了一个等于以下查询的变量。

CREATE PROCEDURE SP_VALORS
    (@NIVEL VARCHAR(15),
     @MES INT,
     @AÑO INT)
AS
BEGIN
    DECLARE @TOTALMESACTUAL FLOAT, @TOTALMESPASADO FLOAT

    SET @TOTALMESACTUAL = (SELECT SUM(MONTODEBITO) - SUM(MONTOCREDITO) 
                           FROM PRUEBAOPEX 
                           WHERE MONTH(FECHA) = @MES 
                             AND YEAR(FECHA) = @AÑO)
END

When executing the procedure, it returns the value correctly.执行该过程时,它会正确返回值。

在此处输入图像描述

I also need to declare another variable that displays the total for the month before the month I pass as a parameter in my procedure.我还需要声明另一个变量,该变量显示我在过程中作为参数传递的那个月之前的那个月的总数。

I have the following example:我有以下示例:

SELECT SUM(MONTODEBITO) - SUM(MONTOCREDITO)
FROM PRUEBAOPEX
WHERE MONTH(FECHA) = 2-1 AND YEAR(FECHA) = 2021

When I send 2 (February) to 12 (December) as a parameter, it shows me correctly.当我发送 2(二月)到 12(十二月)作为参数时,它正确地显示了我。

More than all my doubt is in the case of sending 1 (January) as a parameter.我最怀疑的是发送 1(一月)作为参数的情况。 It should show me the total for December of the previous year.它应该显示上一年 12 月的总数。 How could I declare this variable?我怎么能声明这个变量?

Thank you for any help you may receive.感谢您提供的任何帮助。

You will get better performance from the current code by changing it like this:通过像这样更改当前代码,您将获得更好的性能:

DECLARE @Month DateTime = DatefromParts(@AÑO, @MES, 1)

SET @TOTALMESACTUAL = (SELECT SUM(MONTODEBITO) - SUM(MONTOCREDITO) 
                       FROM PRUEBAOPEX 
                       WHERE @Month <= FECHA and FECHA < Dateadd(month, 1, @Month)
)

The improved performance is because the FECHA column now remains unaltered for the query, and will therefore work better (at all) with any indexes you have.改进的性能是因为FECHA列现在对于查询保持不变,因此将更好地(完全)与您拥有的任何索引一起工作。

More importantly, this is also very easy to convert to get the previous month:更重要的是,这也很容易转换为上个月:

DECLARE @Month DateTime = DatefromParts(@AÑO, @MES, 1)

Set @Month = DATEADD(month, -1, @Month)

SET @TOTALMESACTUAL = (SELECT SUM(MONTODEBITO) - SUM(MONTOCREDITO) 
                       FROM PRUEBAOPEX 
                       WHERE @Month <= FECHA and FECHA < Dateadd(month, 1, @Month)
)

You should be using date boundaries, not using syntax like WHERE MONTH(SomeDate) = @SomeMonthNumber .您应该使用日期边界,而不是使用WHERE MONTH(SomeDate) = @SomeMonthNumber类的语法。 This means you can make a SARGable query, and you can easily apply better logic to the date boundary you want.这意味着您可以进行 SARGable 查询,并且可以轻松地将更好的逻辑应用于所需的日期边界。

An easy way to get a date from a month and year value is to use DATEFROMPARTS .从月份和年份值中获取日期的一种简单方法是使用DATEFROMPARTS As you want the whole of a specific month, you can use 1 for the day of the month.当您想要整个特定月份时,您可以使用1作为该月的第几天。

After making some other changes, as there are some odd choices in your procedure (variables that are declared and not used, a lack of the procedure returning anything), I suspect you want something like this:进行一些其他更改后,由于您的过程中有一些奇怪的选择(已声明但未使用的变量,缺少返回任何内容的过程),我怀疑您想要这样的东西:

--I have dropped the prefix as I recommend in the comments of your prior question.
CREATE PROCEDURE dbo.VALORS @NIVEL varchar(15), @MES int, @AÑO int, @TOTALMESACTUAL float = NULL OUTPUT AS 
BEGIN

    SELECT @TOTALMESACTUAL = SUM(MONTODEBITO - MONTOCREDITO) --There's no need for a subquery here
    FROM dbo.PRUEBAOPEX 
    WHERE FECHA >= DATEFROMPARTS(@AÑO, @MES, 1)
      AND FECHA < DATEADD(DAY, 1, DATEFROMPARTS(@AÑO, @MES, 1));

END;

If you wanted to get the prior month, you can easily apply a further DATEADD to subtract a month from the expression ( DATEADD(MONTH, -1, <Expression>) ).如果您想获得一个月,您可以轻松地应用进一步的DATEADD从表达式中减去一个月 ( DATEADD(MONTH, -1, <Expression>) )。

Also, I suspect that float is not the right choice for your data type, and that a base-10 data type would be better;另外,我怀疑float不是您数据类型的正确选择,以 10 为基数的数据类型会更好; though without knowing what SUM(MONTODEBITO - MONTOCREDITO) represents, I haven't changed the data type.虽然不知道SUM(MONTODEBITO - MONTOCREDITO)代表什么,但我没有更改数据类型。

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