MySQL的組由SUM

Question

我有這樣

表（cat_name，量）在表中的類別;

如何獲得的amount每個cat_name的總和cat_name

Answer 1

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

分組

Answer 2

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