MYSQL returning duplicate rows

Question

I have a Database table in MYSQL, it looks like this:

Project_ID  user_ID  name
11          1        fred
11          2        rick
11          1        fred         


        

Answer 1

Point 1 is that should the user be assigned to the project twice?

Point 2 - Use the DISTINCT keyword to return only unique records - http://dev.mysql.com/doc/refman/5.0/en/distinct-optimization.html

SELECT DISTINCT user_ID
FROM TABLE
WHERE Project_id = 11

That will return you 1 and 2 (You won't get 1 twice)

Thanks