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

There are multiple rows with the same date, but the time is different. Therefore, DISTINCT start_date will not work. What you need is: cast the start_date to a DATE (so the TIME part is gone), and then do a DISTINCT:

SELECT DISTINCT CAST(start_date AS DATE) FROM table;

Depending on what database you use, the type name for DATE is different.