Hello,
sorry your description is not clear ...
why do you use a GROUP BY on product without aggregation function min, max,
sum ?
where is defined numberOfPremiumDays ?
may be using UNION can solve your problem:
select
numberOfPremiumDays,
product_id,
premium_price,
period_price
from product, PremiumDays
where occupation_type_id = 1
and numberOfPremiumDays = date_part('day',
('2018-11-05'::timestamp) - ('2018-11-01'::timestamp))
UNION ALL
select
numberOfPremiumDays,
product_id,
classic_price,
period_price
from product1, PremiumDays
where occupation_type_id = 1
and numberOfPremiumDays != date_part('day',
('2018-11-05'::timestamp) - ('2018-11-01'::timestamp))
Regards
PAscal
--
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