Re: is there better way than the call a function twice.
- From: Stephane Faroult <sfaroult@xxxxxxxxxxxx>
- To: "'Oracle L (E-mail)'" <oracle-l@xxxxxxxxxxxxx>, "Kathy'" <kduret@xxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 3 Nov 2004 10:47:39 +0100
I usually try to get rid of function calls, especially costly ones, in SQL
statements but when everything fails I try to use packaged variables, eg
create package wrapper
as
function ugly_func(param in some_type)
return whatever;
end;
create package body wrapper
as
hidden_var whatever;
previous_parameter some_type := NULL;
function ugly_func(param in some_type)
return whatever
is
begin
if (param = previous_parameter)
then
-- Unless the function calls a random function ...
return hidden_var;
end if;
hidden_var := ugly_function(param);
previous_parameter := param;
return hidden_var;
end;
end;
and replace calls to ugly_function with calls to wrapper.ugly_func.
Regards,
Stephane Faroult
RoughSea Ltd
http://www.roughsea.com
On Tue, 2 Nov 2004 16:49 , 'Duret, Kathy' <kduret@xxxxxxxxxxxxxxxxxxxx>
sent:
oh magic eight ball is there a better way than calling a ugly function twice
when I need two columns returned with the same value.
I hate the call the function twice because it is very costly.
what I need to do is:
select x,y,z, ugly_function as ugly1, ugly_function ugly2 from a
when I do.... it actually gives me worse results ie. more physical reads....
select x,y,z , ugly1, ugly1 as ugly2 from (
select x,y,z, ugly_function ugly1 from a)
Is there anyway around this?
Kathy.
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