PL/SQL: Optimize for speed

Question

I've got a very simple function that i need
use to order the result of a SELECT.
I takes two parameters. One is the current code (that keeps changing with the values of
the SELECT), and the other does not
change.
I'm using Oracle 8.1.5 under Linux and i'd
like to optimize this for speed.
Any suggestions?
Thanks a lot!
FUNCTION OrdenarNomenclator2 (CurrentCode in varchar2, CodeToFind in varchar2) return number IS
BEGIN
IF CurrentCode LIKE CodeToFind| |'%' then
IF CurrentCode = CodeToFind then
return 20;
ELSE
return 10;
END IF;
ELSE
return 0;
END IF;
END;

Answer 1

Ferran,
There is an overhead in calling stored functions. Try this as an expression in your select:
decode(CurrentCode ,CodeToFind,20,decode(substr(CurrentCode ,1,length(CodeToFind)),CodeToFind,10,0))
which seems quite fast.
<BLOCKQUOTE><font size="1" face="Verdana, Arial, Helvetica">quote:</font><HR>Originally posted by Ferran Foz ([email protected]):
I've got a very simple function that i need
use to order the result of a SELECT.
I takes two parameters. One is the current code (that keeps changing with the values of
the SELECT), and the other does not
change.
I'm using Oracle 8.1.5 under Linux and i'd
like to optimize this for speed.
Any suggestions?
Thanks a lot!
FUNCTION OrdenarNomenclator2 (CurrentCode in varchar2, CodeToFind in varchar2) return number IS
BEGIN
IF CurrentCode LIKE CodeToFind| |'%' then
IF CurrentCode = CodeToFind then
return 20;
ELSE
return 10;
END IF;
ELSE
return 0;
END IF;
END; <HR></BLOCKQUOTE>
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