If the value in the column is repeatable, how do you find out the unique values?

Question

Hello
If the value in the column is repeatable, how do you find out the unique values?
please reply me. i am waiting for your reply.
Thanx

Answer 1

Use DISTINCT in the query, such as SELECT DISTINCT user_firstname FROM users; You can also ask for a number of distinct values by saying SELECT COUNT (DISTINCT user_firstname) FROM users;