Математические функции в SQL

select 

amount,

amount + 2,

amount - 3,

amount * 1.5,

amount / 3,

amount ^ 2,

amount % 4,

mod(amount, 4),

amount / 2,

div(amount, 2),

round(amount / 2, 1),

floor(amount / 2),

ceil(amount / 2)

from 

public.payment;