Question : How to count based on a condition in MySQL

How do I count conditionally in MySQL?

SELECT CITY, COUNT(ID) AS TOTALREGISTERED FROM REGISTRATIONS GROUP BY CITY ORDER BY CITY;

Gives me:

New York   16
Cincinatti     14
Miami           11

SELECT CITY, COUNT(ID) AS TOTALATTENDED FROM REGISTRATIONS  WHERE ATTENDED='Y' GROUP BY CITY ORDER BY CITY;

Gives me:

New York   8
Cincinatti     6
Miami          3


How can I get:

New York   16  8
Cincinatti     14  6
Miami           11  3

Answer : How to count based on a condition in MySQL

Try this...

SELECT CITY, COUNT(ID) AS TOTALREGISTERED, SUM(CASE WHEN ATTENDED='Y' THEN 1 ELSE 0 END) as TOTALATTENDED FROM REGISTRATIONS GROUP BY CITY ORDER BY CITY