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

This query makes sure that the combination of column1 and column2 is unique, while selecting the minimum value of column three

SELECT col1, col2, MIN(col3)
FROM yourTable
GROUP BY col1, col2