Question

I have a query that checks a tables and groups all entries from a user and counts those entries

  SELECT username, 
         count(userid)  
    FROM orders 
GROUP BY userid

This returns a list of username’s and how many orders they have submitted

username  count(userid)
------------------------
test      1  
test2     1  
test3     3  
test4     3  
test4     3  
test4     3  

What i want the query to do is count how many users have X orders and return that number.

So from the above results users that have 1 order should be 2 and users that have 3 orders should be 4. So on and so forth can this be done?

Answer 1

Use:

SELECT COUNT(*)
  FROM (SELECT o.username, 
               COUNT(o.userid) AS cnt
          FROM ORDERS o
      GROUP BY o.userid
        HAVING cnt = ?) x

Replace “?” with the number you want to see the number of users with that count value.