[ADMIN] Primary key on existing table?

[Carol Walter]

This may be a silly question but I don't see any place where the  
documentation explicitly addresses whether or not you can designate a  
particular column as a primary key after the table is created.  I used  
the "create table as " syntax to create a table with the same columns  
as an original table, but I want to rename id column, make it a  
serial, and designate it as a primary key.  Is it possible to do  
this?  I've tried a number of things to do this and none of them have  
worked.

Carol
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