在MySql中按组计算唯一记录

Question

Here is my Query

SELECT count(*) as count 
FROM `tbl_track` 
GROUP BY `user_id`

Its Result is (1 person visit 2times + 1 person visit 2times + 1 person visit 1time)

Count
2
2
1

I want a result (2 person visit 2times + 1 person visit 1time)

Count
2
1

Answer 1

SELECT count(*) as `count`, `visit_times` 
FROM (
  SELECT count(*) as `visit_times` 
  FROM `tbl_track` 
  GROUP BY `user_id`
) AS t GROUP BY `visit_times`

Answer 2

try this:

select cnt as user_count,COUNT(*) as count
from
(
SELECT   COUNT(*) as cnt 
FROM tbl_track 
GROUP BY userid)a
group by cnt

SQL Fiddle demo

Answer 3

Try this:

SELECT DISTINCT VisitsCount
FROM
(
    SELECT COUNT(*) AS VisitsCount
    FROM TableName
    GROUP BY UserId
) T