Top 'n' results for each keyword

Question

I have a query to get the top \'n\' users who commented on a specific keyword,

SELECT `user` , COUNT( * ) AS magnitude
FROM `results`
WHERE `keyword` = \"ec         


        

Answer 1

You can use a pattern like this (from Within-group quotas (Top N per group)):

SELECT tmp.ID, tmp.entrydate 
FROM ( 
  SELECT 
    ID, entrydate, 
    IF( @prev <> ID, @rownum := 1, @rownum := @rownum+1 ) AS rank, 
    @prev := ID 
  FROM test t 
  JOIN (SELECT @rownum := NULL, @prev := 0) AS r 
  ORDER BY t.ID 
) AS tmp 
WHERE tmp.rank <= 2 
ORDER BY ID, entrydate; 
+------+------------+ 
| ID   | entrydate  | 
+------+------------+ 
|    1 | 2007-05-01 | 
|    1 | 2007-05-02 | 
|    2 | 2007-06-03 | 
|    2 | 2007-06-04 | 
|    3 | 2007-07-01 | 
|    3 | 2007-07-02 | 
+------+------------+