Question

我的数据库duplicate_id中有一个表，其中包含多个ID，并且还包含许多重复的ID。我一直试图做的是对表格duplicate_id中重复次数最多的五个ID进行排序。请让我知道我该怎么做

表格结构： ID |消息

预期输出：

ID |重复次数

201 8

212 7

205 5

209 3

229 2

Answer 1

SELECT ID, COUNT(*) AS `Number of repeats`
FROM duplicate_id
GROUP BY ID
ORDER BY COUNT(*) DESC
LIMIT 5

Answer 2

按顺序尝试排序结果：

Select * from table order by repeats desc limit 5

Answer 3

嗯...试试这个（我不知道mysql，所以我不得不猜）

select ID, 
       count(*) as 'Number of Repeats'
from   duplicate_ID
group  by ID
order  by 2

另一种方法是

select ID, 'Number of Repeats'
from (
  select ID, 
         count(*) as 'Number of Repeats'
  from   duplicate_ID
  group by ID
  ) x
order by 'Number of Repeats'

按前五个重复ID排序

3 个答案: