[Ur] 3rd day on Ur tutorial

[Adam Chlipala]

Gian Perrone wrote:
> The MySQL choice is mostly because I was trying to make the tutorial 
> something resembling "how perform using Ur/Web some task that I might 
> perform using PHP or Ruby on Rails?", and with both of those 
> environments, MySQL is the de facto standard (for good for for bad).  
> If anyone figures out the correct parameters necessary to make 
> Postgres work with the existing tutorial application, I'd be happy to 
> add those.

If I remember correctly, the simple bootstrapping sequence for Postgres 
is (fill in your UNIX username for $USER, database name for $DB, .sql 
filename for $SQL):

sudo -u postmaster psql template1
CREATE USER $USER WITH CREATEDB;
^D
createdb $DB
psql -f $SQL.sql $DB

...and then the simple .urp file that's already in the tutorial should work.