每年如何查询？

Question

我想问一个问题：每年哪个生产商销售的汽车最多？我可以在查询中定义年份，但是每年如何自动列出？

SELECT producer, COUNT(type) AS counter
FROM `car` 
INNER JOIN producer ON car.producer= producer.id 
WHERE produce_year = 2000 
GROUP BY type 
ORDER BY COUNT(type) DESC 
LIMIT 1

Answer 1

将年份添加到GROUP BY中。删除WHERE子句。

SELECT producer, produce_year, COUNT(type) AS counter
FROM `car` 
INNER JOIN producer ON car.producer = producer.id 
GROUP BY producer, produce_year 
ORDER BY COUNT(type) DESC 

Answer 2

这将起作用：

select * from (SELECT producer, COUNT(type) as cou
,RANK() OVER (PARTITION BY produce_year ORDER BY COUNT(type)) AS myrank
FROM car c 
INNER JOIN producer p ON c.producer= p.id  
GROUP BY  produce_year) 
where myrank=1;