How do I install PostgresSQL interface for perl for programming purpose under Redhat / RHEL / Fedora / CentOS Linux?

perl-DBD-Pg is an implementation of DBI (a database interface for Perl) for PostgreSQL for Perl. This packages allow you to access database environments in a standard way. The system implements each supported database environment as a DBD driver, in much the same way that hardware devices from multiple vendors can operate with different CPU platforms. You can install it as follows using the yum command:
# yum install perl-DBD-Pg
Sample outputs:

Loaded plugins: rhnplugin, security
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package perl-DBD-Pg.x86_64 0:1.49-2.el5_3.1 set to be updated
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package         Arch       Version              Repository                Size
================================================================================
Installing:
 perl-DBD-Pg     x86_64     1.49-2.el5_3.1       rhel-x86_64-server-5     115 k

Transaction Summary
================================================================================
Install       1 Package(s)
Upgrade       0 Package(s)

Total download size: 115 k
Is this ok [y/N]: y
Downloading Packages:
perl-DBD-Pg-1.49-2.el5_3.1.x86_64.rpm                    | 115 kB     00:00     
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing     : perl-DBD-Pg                                              1/1 

Installed:
  perl-DBD-Pg.x86_64 0:1.49-2.el5_3.1                                           

Complete!