Question

I have a table which stores the rating given by the user.

eg:

UserId  Rating
 3            1  
 3            2
 1            1
 1            2
 1            3
 1            4
 2            1
 2            23
 2            4

I need to retrieve the 10 users who have rated the maximum number of times.

eg:

 1 rated 4 times
 2 rated 3 times
 3 rated 2 times...

Any idea how to write a query using mysql?

Answer 1

You have to group by userID, count the grouped rows, and order by the count in descending order, then you limit the query to 10 rows:

SELECT userID, count(*) times
FROM users
GROUP BY userID
ORDER BY times DESC
LIMIT 10

If you need the output exactly as shown above, try this:

SELECT CONCAT_WS(' ', userID, 'rated', count(*), 'times')
FROM users
GROUP BY userID
ORDER BY count(*) DESC
LIMIT 10

See this fiddle.