Php 从2个字段计数

作为MySQL/PHP Noob，我正在努力解决以下问题：

名为“cars”的表

名为“modell”和“engine”的字段

想写一个问题并得到答案：

以下是：

2 volvo with 2,0 engine  
1 volvo with 2,6 engine  
3 saab with 1,8 engine  
1 saab with 2,1 engine  
1 Chevrolet with 4,2 engine  

选择COUNT（*），Model，ENGINE FROM cars GROUP BY Model，ENGINE

选择COUNT（*），Model，ENGINE FROM cars GROUP BY Model，ENGINE

2 volvo with 2,0 engine  
1 volvo with 2,6 engine  
3 saab with 1,8 engine  
1 saab with 2,1 engine  
1 Chevrolet with 4,2 engine  

select modell, engine, count(*) as cnt
from cars
group by modell, engine

SELECT count(*) AS count,
       Modell,
       engine 
FROM cars 
GROUP BY Modell,engine