Two questions in a row

Hello people,

I have two questions I would like to know if
anyone can help me with:

1. How do you remove one of two identical rows
from a pgsql table ?

2. How can I restrict connection to a certain
database (locally) on a user basis ? I mean,
I want to permit connection to mydb1 from user
user1 only and connection to mydb2 from user
user2 only..

P.S.: Excuse me for the newbiness on any of
these 2 questions.. :-)

Thanks in advance,

--
Renato Moutinho Silva

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