Question

I have a MySQL database with two tables in it:

Members
 - id, name, city_id

and:

Cities
- id, name

I want a query that will return each city name and how many members are in it.

The output I need is:

city_name    count
------------------
New York     15
Los Angeles  20

Answer 1

something like this:

SELECT a.name, COUNT(DISTINCT b.city_id) 
FROM Cities a JOIN Members b 
ON b.city_id = a.id  
GROUP BY b.city_id