有没有办法按发生频率排列mysql行？

Question

是否有一种方法按发生频率排序mysql行？

Answer 1

SELECT n, count(*) as freq 
FROM your_table 
GROUP BY n 
ORDER BY freq DESC; 

一个更具体的例子：

SELECT n, count(*) as freq 
FROM (
    SELECT 1 as n 
    UNION ALL 
    SELECT 2 as n 
    UNION ALL 
    SELECT 3 as n 
    UNION ALL 
    SELECT 3 as n 
    UNION ALL 
    SELECT 3 as n 
    UNION ALL 
    SELECT 2 as n) as your_table 
GROUP BY n 
ORDER BY freq DESC; 

将返回：

n, freq 
3, 3 
2, 2 
1, 1