求和函数

Question

我的SQL查询在对结果上的行求和时＃1111 - 无效使用组函数

此查询工作正常并返回许多行。

SELECT credit.Amount - SUM( COALESCE( creditreceived.Amount, 0 ) ) AS 
AmountReceivable FROM credit LEFT JOIN creditreceived ON credit.ID = 
creditreceived.CreditID WHERE credit.CompanyID =  '1' GROUP BY credit.id

结果图片： http://oi65.tinypic.com/qplyli.jpg

我想对这些行求和，为此我正在使用此查询

SELECT SUM( credit.Amount - SUM( COALESCE( creditreceived.Amount, 0 ) ) ) AS
AmountReceivable FROM credit LEFT JOIN creditreceived ON credit.ID = 
creditreceived.CreditID WHERE credit.CompanyID =  '1' GROUP BY credit.id

这是返回错误＃1111 - 无效使用群组功能

Answer 1

它认为问题不在于群体。尝试

SUM( credit.Amount - COALESCE( creditreceived.Amount, 0 ) ) AS..