How to create a function that returns multiple rows in table

Question

Dear all,
I want to create a funtion that returns multiple rows from the table (ex: gl_balances). I done following:
-- Create type (successfull)
Create or replace type tp_gl_balance as Object
PERIOD_NAME VARCHAR2(15),
CURRENCY_CODE VARCHAR2(15),
PERIOD_TYPE VARCHAR2(15),
PERIOD_YEAR NUMBER(15),
BEGIN_BALANCE_DR NUMBER,
BEGIN_BALANCE_CR NUMBER
-- successfull
create type tp_tbl_gl_balance as table of tp_gl_balance;
but i create a function for return some rows from gl_balances, i can't compile it
create or replace function f_gl_balance(p_period varchar2) return tp_tbl_gl_balance pipelined
as
begin
return
(select gb.period_name, gb.currency_code, gb.period_type, gb.period_year, gb.begin_balance_dr, gb.begin_balance_cr
from gl_balances gb
where gb.period_name = p_period);
end;
I also try
create or replace function f_gl_balance(p_period varchar2) return tp_tbl_gl_balance pipelined
as
begin
select gb.period_name, gb.currency_code, gb.period_type, gb.period_year, gb.begin_balance_dr, gb.begin_balance_cr
from gl_balances gb
where gb.period_name = p_period;
return;
end;
Please help me solve this function.
thanks and best reguard

Answer 1

hi,
Use TABLE FUNCTIONS,
[http://www.oracle-base.com/articles/9i/PipelinedTableFunctions9i.php]
Regards,
Danish