Question

I wrote the following query to return some statistics about purchases made in the X amount of time. But for some reason every “COUNT” column return the total number of rows. Did I organize the query incorrectly?

SELECT COUNT(*) as countTotal, SUM(`cost`) as cost, COUNT(`paymentType` = 'credit') as count_credit, COUNT(`paymentType` = 'cash') as count_cash 
FROM `purchase` WHERE `date` >= '2011-5-4'

update

I just decided to use sub-queries. This is what I ended up with.

SELECT 
COUNT(*) as countTotal,
SUM(`cost`) as cost, 
(SELECT COUNT(*) FROM `purchase` WHERE `paymentType` = 'credit') as count_credit, 
(SELECT COUNT(*) FROM `purchase` WHERE `paymentType` = 'cash') as count_cash 
FROM `purchase` WHERE `date` >= '2011-5-4'

update2

Used ypercubes answer below.

Answer 1

It doesn’t look correct but changing COUNT() to SUM() works fine:

SELECT COUNT(*) AS countTotal
     , SUM(cost) AS cost
     , SUM(paymentType = 'credit') AS count_credit   --- SUM does counting here
     , SUM(paymentType = 'cash') AS count_cash       --- and here
FROM purchase
WHERE `date` >= '2011-05-04'

Explanation: True == 1 and False == 0 for MySQL.