SUM AND MAX的SQL代码

Question

我有下表，想写一个SQL语句来总结每篇文章和Extract Maximum？ ：

| A | 3 |
| B | 6 |
| A | 4 | 

输出：A = 7，B = 6.

Answer 1

select columnname,sum(columnname),max(expression/columnname)
from tablename 
group by columnname

Answer 2

像这样;

SELECT Article, SUM(Num_Column)
FROM Table_Name
GROUP BY Article
ORDER BY Article