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 that the first column is unique, you can do this:

SELECT id, col2, col3, col4
FROM yourtable
WHERE id IN
(
    SELECT MIN(id)
    FROM yourtable
    GROUP BY col2, col3
)

See it working online: sqlfiddle