SQL How to remove duplicates within select query?

Question

I have a table which looks like that:

As You see, there are some date duplicates, so how t

Answer 1

If you want to select any random single row for particular day, then

SELECT * FROM table_name GROUP BY DAY(start_date)

If you want to select single entry for each user per day, then

SELECT * FROM table_name GROUP BY DAY(start_date),owner_name