PHP & PostgreSQL

I'm switching from a MySQL environment to PGSQL and I'm going through and trying to learn the differences between the two. I've come across some issues that I can't seem to find the answers to in the docs or on the web. I'm hoping someone can help me out. * MySQL has a function to reset the result set so that it can be iterated through again - mysql_data_seek(). I don't see that there is a similar function for PGSQL. Is that true? If so, in order to reset the result set you have to perform the query again? Isn't that a waste of resources? * For PGSQL, you can get the database name, the field name even the *host name* but you can't get the table name from a particular query? Any info would be greatly appreciated! Chris