有没有办法按出现频率排序mysql行？

Question

是否有按出现频率命令mysql行的方法？

Answer 1

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

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