Your Perl scripts can connect to PostgreSQL databases using the DBI (Database Interface) module.
To connect to PostgreSQL and choose a database, use the following Perl code. Replace 'username' with your username, 'password' with your password, and 'dbname' with the database name.
use DBI;
$myConnection = DBI->connect("DBI:Pg:dbname=dbname;host=localhost", "username", "password");
Following the code's selection of the database and connection to PostgreSQL, you can run SQL queries and perform other operations.