%Alter Help - Mailing list pgsql-admin

Hi all, I have a new question, know i'm trying to alter one of my
tables,but the thing is, that I need to change the range of one of my
columns, I've allready try this:

ALTER TABLE lugar alter column sitio varchar2(500);

but it gives me a syntax error. and i don't know why.

Any help I'll appreciate .

Regards.