try this one wonder-FOOL.
SELECT (SUM(CASE WHEN rec.rmaNum = 0 THEN 1 ELSE 0 END)) as 'Created',
(SUM(CASE WHEN rec.rmaNum IN ('1','2') THEN 1 ELSE 0 END)) as 'Received',
(SUM(CASE WHEN rec.rmaNum = 3 THEN 1 ELSE 0 END)) as 'Closed',
(SUM(CASE WHEN rec.rmaNum = 4 THEN 1 ELSE 0 END)) as 'Voided',
FROM RMARecords AS rec
LEFT OUTER JOIN RMAUsers AS usr ON rec.userCreated = usr.id
GROUP BY rec.rmaNum
If you have questions just comment, and if this is helpful mark as answer.
Best Regards,
@iamsupergrasya