无法使用group by运行查询

Question

我试图执行以下命令：

SELECT name,sum(mark) 
FROM students 
group by name order by mark

但我收到了错误。

  

专栏＆＃34; students.mark＆＃34;在ORDER BY子句中无效，因为它不包含在聚合函数或GROUP BY子句中。

我无法理解错误。

Answer 1

尝试使用此

SELECT name,sum(mark) FROM students group by name order by sum(mark)

希望这有帮助

Answer 2

将SUM汇总移至Order by

SELECT name,sum(mark) FROM students group by name order by sum(mark)

或使用别名

SELECT name,sum(mark) as Mark FROM students group by name order by mark

Answer 3

这应该对你有用，

SELECT name,sum(mark) FROM students group by name order by sum(mark)

您需要按顺序指定sum聚合