MySql中多行的总和

Question

我有这样的数据

ID       SUB       Marks    
 1      English      25
 1       Maths       22
 1      Science      15
 2      English      16
 2       Maths       20
 2      Science      12

等等......

如何对所有主题标记求和并给出每个ID的总分？

例如，如果我选择ID = 1，那么它应该显示62。

Answer 1

select id, sum(Marks) as marks
from tablename
group by id

Answer 2

这应该这样做：

SELECT ID, SUM(Marks) as totalMarks
FROM MyTable
GROUP BY Id

Answer 3

试试这个...这是有效的......

SELECT ID, SUM(Marks) as Total
FROM Table_Name
GROUP BY ID
ORDER BY ID