The following works - returns Y when chargeback equal to 1 else it defaults to N
IF(fd.charge_back = 1, \'Y\', \'N\') AS charge_back
howeve
IF(compliment IN('set','Y',1), 'Y', 'N') AS customer_compliment
Will do the job as Buttle Butkus suggested.
Presumably this would work:
IF(compliment = 'set' OR compliment = 'Y' OR compliment = 1, 'Y', 'N') AS customer_compliment