Selecting distinct 2 columns combination in mysql

Question

I have a mysql table that looks like this:

1   value1    value2    3534
2   value1    value1    8456
3   value1    value2    3566
4   value1    value3    734         


        

Answer 1

Assuming the columns in the table are (id, col1, col2, col3), you could:

SELECT  *
FROM    YourTable yt
JOIN    (
        SELECT  MIN(id) as minid
        FROM    YourTable
        GROUP BY
                col1, col2
        ) filter
ON      filter.minid = yt.id