MySql滚动总和问题

Question

我想要对列进行滚动求和。我创建了以下查询

SET @FinancialIncremental:=0;
SELECT  j.ErrorCategory, 
        COUNT(IF(j.ErrorType = 'P',j.ErrorType,NULL)) AS Financial,
        COUNT(IF(j.ErrorType = 'NP',j.ErrorType,NULL)) AS Procedural,
        SUM(j.OverPaymentAmount) AS 'Financial Over Paid Amount ($)',       
        (
            SELECT
                @FinancialIncremental := @FinancialIncremental + q1.c
            FROM
            (   
                (SELECT
                COUNT(IF(ErrorType = 'P',ErrorType,NULL)) AS c
                FROM DemoScheme.TestTable WHERE IsDeleted = 0 AND ErrorType IN ('P','NP')
                GROUP BY ErrorCategory) AS q1
            )
         ) AS 'Financial Incremental'
FROM DemoScheme.TestTable j WHERE IsDeleted = 0 AND ErrorType IN ('P','NP')
GROUP BY ErrorCategory;

但是它给了我一个错误。它给我一个关于“财务增量”子查询的错误

Error Code: 1242. Subquery returns more than 1 row

谁能帮我解决这个问题吗？

Answer 1

其中有一些重复，这使事情变得不必要地复杂化，请尝试此查询。添加时，您可能还需要将 NULL 替换为 0。

 SET @FinancialIncremental:=0;
SELECT  j.ErrorCategory, 
        COUNT(IF(j.ErrorType = 'P',j.ErrorType,NULL)) AS Financial,
        COUNT(IF(j.ErrorType = 'NP',j.ErrorType,NULL)) AS Procedural,
        SUM(j.OverPaymentAmount) AS 'Financial Over Paid Amount ($)',       
        (@FinancialIncremental := @FinancialIncremental + COUNT(IF(j.ErrorType = 'P',j.ErrorType,0))
 AS 'Financial Incremental'
FROM DemoScheme.TestTable j WHERE IsDeleted = 0 AND ErrorType IN ('P','NP')
GROUP BY ErrorCategory;