i want to provide additional condition before sql execution

i want to provide additional condition before sql execution,,
the condition is :
IF the orc EXIST on table outputcut
run the sql:

SET @orc='G1-21E014E-1';
SELECT 
 oc.size AS size,
 ic.qty AS `order`,
 oc.qty AS output,
IF( ic.qty-oc.qty >0, 'sisa', IF (ic.qty-oc.qty < 0, 'kurang','cukup')) AS produksi,
 ic.qty-oc.qty AS WIP
.....
 

,
ELSE run sql :

SELECT 
'Production hasn't started yet'

please help me to adding if condition on this quaery