Question

With some help from someone here on Stackoverflow i almost got to the point where the query is perfect. I need some little help adjusting the query to fit my needs, and i hope someone could help me out again.

Here’s the case, i have the following 2 tables :

Tweet

and

Tweet_tags

Every tweet has a tag, and a tweet can have more of the same tags. I want to count how many tweets have the same tag within a time span of week since the tweet was posted.

Here is the query as it is now :

SELECT t.id
     , s.tag
     , ( SELECT COUNT(1)
           FROM twitter.tweet_tags r
           JOIN twitter.tweet q
             ON q.id = r.tweet_id
          WHERE r.tag = s.tag
            AND q.date >= t.date
            AND q.date <= t.date + INTERVAL 7 DAY
       ) AS cnt
  FROM twitter.tweet t 
  JOIN twitter.tweet_tags s 
    ON s.tweet_id = t.id
 ORDER
    BY cnt DESC

The results of this query are :

  | ID |     Tag      | Cnt |
-------------------------------
  | 1  |  Testtag     | 2   |
  | 2  |  Testtag     | 1   |
  | 3  |  tweettag3   | 1   |
  | 4  |  tweettag2   | 1   |

I have the testtag 2 times in my database, so the first result is correct, tweettag3 and tweettag2 are in my database 1 time so thats good as well, but these will probably also show multiple results when i add them again. I tried using DISTINCT on s.tag to get rid of the duplicate result, however this gives me a syntax error.

So how i want it to be is :

  | ID |     Tag      | Cnt |
-------------------------------
  | 1  |  Testtag     | 2   |
  | 2  |  tweettag3   | 1   |
  | 3  |  tweettag2   | 1   |

Could someone please help me out on this? If you need more information please say so!

Thanks !!

Edit :

This is how the tables look:

Tweet
---------------
ID
Message
users_id
Date

Tweet_tags
---------------
id
tag
tweet_id

Answer 1

You can just use select distinct, so the query would be:

SELECT distinct s.tag
     , ( SELECT COUNT(1)
           FROM twitter.tweet_tags r
           JOIN twitter.tweet q
             ON q.id = r.tweet_id
          WHERE r.tag = s.tag
            AND q.date >= t.date
            AND q.date <= t.date + INTERVAL 7 DAY
       ) AS cnt
  FROM twitter.tweet t 
  JOIN twitter.tweet_tags s 
    ON s.tweet_id = t.id
 ORDER
    BY cnt DESC

Just remove the id field from the select.

If you want an id, then you can use the MySQL feature of hidden columns to have:

select t.id, s.tag, . . .

group by tag
order by cnt desc