Getting The Last Entry

Hello,

I need to get de last entry from a table. I try using:

DECLARE variable CURSOR FOR SELECT id FROM table;
FETCH LAST FROM variable;

And works fine, but when i try to use this code in a procedure, appears the
following message:

ERROR: syntax error at or near "FETCH"
LINE XX: FETCH LAST FROM raton;
^

********** Error **********

Is there another way to get that last ID?

----
Rodrigo