SQL Group By and min (MySQL)

Question

I have the following SQL:

select code, distance from places;    

The output is below:

CODE    DISTANCE            LOCATION
         


        

Answer 1

To get the correct associated location, you'll need to join a subselect which gets the minimum distance per code on the condition that the distance in the outer main table matches with the minimum distance derived in the subselect.

SELECT a.code, a.distance
FROM   places a
INNER JOIN
(
    SELECT   code, MIN(distance) AS mindistance
    FROM     places
    GROUP BY code
) b ON a.code = b.code AND a.distance = b.mindistance
ORDER BY a.distance