MySQL SELECT DISTINCT multiple columns

Question

Let\'s say I have columns a, b c, d in a table in a MySQL database. What I\'m trying to do is to select the distinct values of ALL of these 4 columns in my tabl

Answer 1

Both your queries are correct and should give you the right answer.

I would suggest the following query to troubleshoot your problem.

SELECT DISTINCT a,b,c,d,count(*) Count FROM my_table GROUP BY a,b,c,d
order by count(*) desc

That is add count(*) field. This will give you idea how many rows were eliminated using the group command.