MySQL组由SUM组成

Question

我在

这样的表格中有类别

表格（cat_name，量）;

如何获得amount每个cat_name的总和cat_name

Answer 1

SELECT cat_name, SUM(amount) AS total_amount
FROM table
GROUP BY cat_name

Answer 2

SELECT cat_name, SUM(amount) AS TotalAmount
FROM Table
GROUP BY cat_name