mysql

Question

我正在尝试的代码如下：

SELECT CONCAT(D.DriverFirstName,' ',D.DriverLastName)AS'Full Name',
SUM(T.EndOdometerKM-T.StartODometerKM) AS'Total KM Travelled'
FROM DRIVER AS D, TRIP AS T
WHERE D.DriverLicenceNum=T.DriverLicenceNum
GROUP BY T.DriverLicenceNum
HAVING SUM (T.EndOdometerKM-T.StartOdometerKM)>1000
ORDER BY SUM (T.EndOdometerKM-T.StartOdometerKM)ASC;

但是，我收到此错误消息：

#1630 - FUNCTION dbname.SUM does not exist.

根据其他帖子，问题通常是函数和括号(SUM (code))之间的空格而不是(SUM(code))，但我的问题仍然存在，没有空格。

Answer 1

这种方式应该起作用

SELECT 
    CONCAT(D.DriverFirstName,' ',D.DriverLastName) AS 'Full Name',
    SUM(T.EndOdometerKM-T.StartODometerKM) AS 'Total KM Travelled'
FROM DRIVER AS D, TRIP AS T
WHERE D.DriverLicenceNum=T.DriverLicenceNum
GROUP BY T.DriverLicenceNum
HAVING SUM(T.EndOdometerKM-T.StartOdometerKM) > 1000
ORDER BY SUM(T.EndOdometerKM-T.StartOdometerKM) ASC;