在动态查询中循环

Question

BEGIN
DECLARE @sqlQuery VARCHAR(MAX)
SET @sqlQuery ='Select Style_Color, Style_Color_Desc as Description, 
 RPT, Weeks,  '

DECLARE @cnt INT = 1
DECLARE @TblCount NVARCHAR(1000) = (SELECT COUNT(ID) FROM table_Name)            

WHILE @cnt <= @TblCount
BEGIN
    SET @sqlQuery = @sqlQuery + 'max(CASE WHEN Cluster_ID = (Select STORE_ID from Table_Name where id= '+@cnt+')
     then CAST(c.APS_Dev as decimal(10,2)) end) as ''APS Dev'' '


     SET @cnt = @cnt + 1
END

SET @sqlQuery = @sqlQuery+'                                          
 Minimum as Pres_Min  From table_Name '

PRINT(@SQLQuery)
END

我收到错误：

Conversion failed when converting the varchar value 'Select Style_Color, Style_Color_Desc as Description,RPT, Weeks, Select STORE_ID from table_name where id= to data type int.

有时当我做一些更改时出现此错误

Cannot perform an aggregate function on an expression containing an aggregate or a subquery

谁能帮我如何在动态查询中声明 while 循环？

Answer 1

在您的情况下，您可以使用两种变体：

1) 使用CAST或CONVERT函数

-- CAST
SET @sqlQuery += 'max(CASE WHEN Cluster_ID = (Select STORE_ID from Table_Name where id= '+CAST(@cnt AS varchar(5))+')
then CAST(c.APS_Dev as decimal(10,2)) end) as ''APS Dev'' '

-- CONVERT
SET @sqlQuery += 'max(CASE WHEN Cluster_ID = (Select STORE_ID from Table_Name where id= '+CONVERT(varchar(5),@cnt)+')
then CAST(c.APS_Dev as decimal(10,2)) end) as ''APS Dev'' '

2) 使用CONCAT函数进行字符串连接

SET @sqlQuery += CONCAT('max(CASE WHEN Cluster_ID = (Select STORE_ID from Table_Name where id= ',@cnt,')
then CAST(c.APS_Dev as decimal(10,2)) end) as ''APS Dev'' ')

在动态查询中循环

While LOOP IN Dynamic QUERY

sql

sql-server

stored-procedures

dynamicquery