count multiple values from single column

Question

I have a table with customer information like date of birth, address, contactinfo, etc.

I want to count the number of customers per city with a single query that outputs two values per record, cityname and amount of customers living there:

Alabama 285
Kentucky 167
New York 4
Rio de Janeiro 950
etc...

There are hundreds of cities in the table so I can't do a

SELECT count(CASE WHEN city = 'Alabama' THEN 1 END) AS Alabama

Answer 1

You can use GROUP BY clause to count the number of customers per city :

SELECT city
     , COUNT(*) 
FROM table 
GROUP BY city