在MySQL语句中使用datediff

Question

这是我使用datediff工作的SQL语句:

SELECT SUM(b134_nettpay) AS Total, b134_rmcid, b134_recdate 
FROM  B134HREC 
WHERE datediff (dd, '2006-05-05', getdate()) > 90
GROUP BY b134_rmcid, b134_recdate 
ORDER BY b134_recdate DESC, b134_rmcid

我需要用MAX替换Hardcoded日期'2006-05-05'(b134_recdate),如下所示:

SELECT SUM(b134_nettpay) AS Total, b134_rmcid, b134_recdate 
FROM  B134HREC 
where datediff (dd, MAX(b134_recdate), getdate()) > 90
GROUP BY b134_rmcid, b134_recdate 
ORDER BY b134_recdate DESC, b134_rmcid

但我收到此错误消息:

聚合可能不会出现在WHERE子句中,除非它位于HAVING子句或选择列表中包含的子查询中,并且要聚合的列是外部引用.

知道如何修复我的SQL语句吗？

Answer 1

尝试

SELECT SUM(b134_nettpay) AS Total, b134_rmcid, b134_recdate 
FROM  B134HRE 
where datediff (dd, 
      (select MAX(b134_recdate) from B134HRE)
      , getdate()) > 90
GROUP BY b134_rmcid, b134_recdate 
ORDER BY b134_recdate DESC, b134_rmcid