如何在MySql中获取值的总和

Question

我有桌子：

id        name      amount
--------------------------
1         abc       1
2         abc       2
3         abc       -3
4         def       4

我想得到每个名字的总和== abc，我的意思是1 + 2 +（ - 3）= 0;

如何在MySql中执行此操作？

Answer 1

SELECT SUM(amount) FROM table WHERE name = 'abc';

Answer 2

不确定mySQL，但“标准”SQL将是：

select sum(amount) from yourTableName where name='abc'

Answer 3

SELECT SUM(amount) AS total FROM table WHERE name = 'abc'

Answer 4

SELECT name, SUM(amount) from Table GROUP BY name;

Answer 5

SELECT SUM(amount)
FROM tableName
WHERE name='abc'