Question

I have the following data structure :

FIRSTNAME    AGE    NICKNAME
Jack         28     Benny
Robert       30     Benny
Pascal       20     Benny
Charles      19     Lence
Anthony      20     Lence

The first column is unique.
The idea is that I have to count how many times the “nickname” is used and I want to output it so that I can I have the following result :

Benny    3
Lence    2

What is the best performant way to do so knowing that I have millions of lines?

Answer 1

Try this:

SELECT NICKNAME,COUNT(NICKNAME)
FROM MyTable
GROUP BY NICKNAME