postgres functions code example
Example 1: create function in postgresql
create [or replace] function function_name(param_list)
returns return_type
language plpgsql
as $$
declare
-- variable declaration
begin
-- logic
end;
$$
Example 2: postgresql functions
CASE
WHEN condition_1 THEN result_1
WHEN condition_2 THEN result_2
...
ELSE result_n
END