Actually, I need the use of case because based on the numberOfPremiumDays
there are different type of treatment:
select numberOfPremiumDays
            case  when numberOfPremiumDays = date_part('day',
('2018-11-05'::timestamp) - ('2018-11-01'::timestamp)) then
                select product_id,
                premium_price,
                period_price
                from product
                where occupation_type_id = 1
                group by product_id, occupation_type_id
           else
                select product_id,
                classic_price,
                period_price
                from product1
                where occupation_type_id = 1
                group by product_id, occupation_type_id

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