在MySQL语句中使用DATEDIFF

Question

这是作品使用DATEDIFF我的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

我需要与MAX（b134_recdate）像这样更换硬编码日期 '2006-05-05'：

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

但是我得到这个错误消息：

  

聚合不应出现在WHERE子句中，除非它是在含有HAVING子句或选择列表在子查询中，并且被聚合的列是外部引用。

不知道如何解决我的SQL语句？

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

Answer 2

您是否尝试过移动这样的：

datediff (dd, MAX(b134_recdate), getdate()) > 90

要HAVING子句？

的SQL语句是：

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

Answer 3

此代码是SQL Server

我不知道，如果MAX是前人的精力对整个表：

DECLARE @MaxDate  datetime
SELECT @MaxDate=MAX(b134_recdate) FROM B134HRE
/* if you don't want time you need to trim it from @maxDate*/

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

或每组：

SELECT
    SUM(b.b134_nettpay) AS Total, b.b134_rmcid, b.b134_recdate 
    FROM  B134HRE   b
        INNER JOIN (SELECT
                        b134_rmcid, b134_recdate , MAX(b134_recdate) AS MaxDate
                        FROM B134HRE
                        GROUP BY b134_rmcid, b134_recdate 
                   ) dt ON b.b134_rmcid=dt.b134_rmcid AND b.b134_recdate=dt.b134_recdate
    where datediff (dd, dt.MaxDate, getdate()) > 90
    GROUP BY b.b134_rmcid, b.b134_recdate 
    ORDER BY b.b134_recdate DESC, b.b134_rmcid

但你可以给这些一试