mysql - 如何在同一列中创建2个order by

Question

我想创建 sql req 以在同一列中两次使用 order by 我尝试使用此示例

SELECT  titleEN, smallDescriptionEN, StartDate, EndDate
            FROM event
            WHERE EndDate > NOW()
            ORDER BY StartDate ASC

UNION

SELECT  titleEN, smallDescriptionEN, StartDate, EndDate
                FROM event
                WHERE EndDate < NOW()
                ORDER BY StartDate DESC

但是sql错误表明UNION和ORDER BY的使用不正确

#1221 - Incorrect usage of UNION and ORDER BY 

Answer 1

末尾的一个 Order By 足以对完整的结果集进行排序

SELECT titleEN,
       smallDescriptionEN,
       StartDate,
       EndDate
FROM   event
WHERE  EndDate < Now()
UNION
SELECT titleEN,
       smallDescriptionEN,
       StartDate,
       EndDate
FROM   event
WHERE  EndDate > Now()
ORDER  BY StartDate DESC;