Call function in sql

Question

HI all,
If I have function as
create or replace function func(id)
return number
as
begin
loop
loop
......does some calculations....
end loop
amt:=........
end loop
return amt
end
now if ihave a query as
select id,gp from t;
id gp
1 20
2 40
Now iwant the amt calculated in function func to be displayed as another column in the query as:
select id,gp,func(id) from t;
id gp func(id)
1 20 100
2 40 300
How to achieve this?
Thanks

Answer 1

You can simply call the function in your query:
SQL> create table t as
  2  select 1 id, 20 gp from dual union
  3  select 2, 40 from dual;
Table created.
SQL> create or replace function func(p_id in number)
  2  return number
  3  as
  4   amt number;
  5  begin
  6    ---do your own thing here, I just made something up here:
  7    for i in 1..p_id*5
  8    loop
  9      amt := 10*i;
10    end loop;
11    return amt;
12  end;
13  /
Function created.
SQL> select id
  2  ,      gp
  3  ,      func(id)
  4  from   t;
        ID         GP   FUNC(ID)
         1         20         50
         2         40        100
2 rows selected.More explanations:
http://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:1547006324238