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

Update 1

Better you use this against above.

SELECT id, col2, col3, col4
FROM yourtable
GROUP BY col2, col3;

Demo

The reason I am saying is because using CONCAT, I am not getting desired result in this case. First query is returning me 5 rows however CONCAT is returning me 4 rows which is INCORRECT.

Hope you got my point.

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Assumed the columns in the table are (id, col2, col3, col4).

SELECT DISTINCT(CONCAT(col2, col3)) as "dummy column", id, col2, col3, col4
FROM yourtable
GROUP BY CONCAT(col2, col3);

OR

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

live working example