Question

In a database, I have fields for scoring users. They are as following:

id | user_id | month | week | activity | speed

So, I want to get activity+speed in one field, BUT from a GROUP_CONCAT results, as I have more than one scoring, for one user (different week & month).

My current query is as following:

SELECT *, GROUP_CONCAT( CONVERT( tfts_bodovanja.activity + tfts_bodovanja.speed, 
      CHAR( 8 ) ) SEPARATOR  '+' ) AS indeks
FROM tfts_fans
GROUP BY user_id
ORDER BY indeks DESC

And it returns (for the bolded part):

191.4000+383.1999

And ordering doesn’t work, obviously.

So, all I want is just to sum up those two numbers and mysql to return them as FLOAT. How is that achievable?

Answer 1

GROUP_CONCAT with a “+” will create a string and won’t do an addition. Assuming you want the sum of (activity+speed) for each user you can do something like this

SELECT user_id,
       SUM( activity + speed ) AS indeks
FROM tfts_fans 
GROUP BY user_id 
ORDER BY indeks DESC