Column does not Exist in postgresql?

I am trying case inside select query and want to use that data column is generated by that case in same query.

My query is :

select order_id , order_item_id , sku ,merchant_payable as "Value Get" , 

case when name like 'Rise%'
    then amount-(((amount*12.14)/100)+ ((amount*3.08)/100) + 51.30)
    when name like 'Masha%'
    then amount-(((amount*9.10)/100)+ ((amount*3.08)/100) + 51.30)
    when name like 'Bboy%'
    then amount-(((amount*14.17)/100)+ ((amount*3.08)/100) + 51.30)
    end as "Value Should Get" ,

 "Value Should Get"  - merchant_payable 
from meta.paytm_payment as ppo  
where
 case when name like 'Rise%'
    then amount-(((amount*12.14)/100)+ ((amount*3.08)/100) + 51.30)
    when name like 'Masha%'
    then amount-(((amount*9.10)/100)+ ((amount*3.08)/100) + 51.30)
    when name like 'Bboy%'
    then amount-(((amount*14.17)/100)+ ((amount*3.08)/100) + 51.30)
    end > merchant_payable

 order by order_created_at ;

Best How To :

You can DRY up the duplication of the projection with a CTE, and then use this in your WHERE predicate:

WITH myCte AS
(
    select order_id , order_item_id , sku ,merchant_payable, order_created_at ,
    case when name like 'Rise%'
        then amount-(((amount*12.14)/100)+ ((amount*3.08)/100) + 51.30)
        when name like 'Masha%'
        then amount-(((amount*9.10)/100)+ ((amount*3.08)/100) + 51.30)
        when name like 'Bboy%'
        then amount-(((amount*14.17)/100)+ ((amount*3.08)/100) + 51.30)
    end as "Value Should Get"
    from paytm_payment as ppo  
)
SELECT *, "Value Should Get"  - merchant_payable AS "Nett"
from myCte
where "Value Should Get" > merchant_payable
order by order_created_at;

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