调整存储过程

Question

我有一个使用参数调用的存储过程。我想检查 PARAM @Value 是什么，并且根据值，如果它等于某个值，我想添加 WHERE 子句的一部分。

假设过程如下所示：

  Select Sum(Cost) as Cost, Car, Make
  INTO #TempTable1
  WHERE 
  1=1 and Date > '04/21/2020'

  IF @Value in (1,2,3)
  AND Color= 'Black'

  GROUP BY
  Car, Make

这是一个非常简单的代码，我的 @Value=1,2,3 的 WHERE 子句会大得多。

基本上，我的目标是在@Value = 1、2、3 的情况下添加 WHERE 子句的一部分。是否可行？

编辑：如果在我的 select 语句上方添加类似

的内容怎么办

 DECLARE @WHERE AS VARCHAR(MAX)
 IF @VALUE IN (1,2,3) 
   SET @WHERE = 'color = ''black'''

Answer 1

您可以添加条件：

AND ((@VALUE IN (1,2,3) AND Color='Black') OR VALUE NOT IN (1,2,3))

或者您可以编写动态 SQL。

DECLARE @Statement NVARCHAR(1000);
SET @Statement = 'Select Sum(Cost) as Cost, Car, Make INTO #TempTable1 WHERE   Date > ''04/21/2020'''
IF(@value in (1,2,3))
  BEGIN
    SET @Statement=@Statement+' and Color=''Black'''
  END
SET @Statement=@Statement+ ' GROUP BY Car,Make ' 
EXEC sp_executesql   @Statement

选择：

Select Sum(Cost) as Cost, Car, Make
INTO #TempTable1
WHERE 
  1=1 and Date > '04/21/2020'
AND  
    CASE WHEN @flag N (1,2,3) 
    THEN color
    ELSE 'Black'
    END = 'Black'
GROUP BY
  Car, Make

最后一个选择：

IF @value in (1,2,3) 
BEGIN
    Select Sum(Cost) as Cost, Car, Make
    INTO #TempTable1
    WHERE 1=1 and Date > '04/21/2020'
    AND color='Black'
    GROUP BY Car, Make
END
ELSE
BEGIN
    Select Sum(Cost) as Cost, Car, Make
    INTO #TempTable1
    WHERE 1=1 and Date > '04/21/2020'
    GROUP BY Car, Make
END

调整存储过程

tweaking stored proc

sql

stored-procedures

where-clause

ssms-2016