Setup current Debian version

Version 9.1 is the current PostgreSQL version in Debian Wheezy (the time of writing this article). Installation is simple:
apt-get install postgresql

Setup latest PostgreSQL version on Debian

1. Add the PostgreSQL Apt Repositorycreate a Debian sources list file (e.g. pgdg.list)
   nano /etc/apt/sources.list.d/pgdg.list
   add the following line and save the file
   deb http://apt.postgresql.org/pub/repos/apt/ wheezy-pgdg main
2. Import the repository signing key
   wget https://www.postgresql.org/media/keys/ACCC4CF8.asc
apt-key add ACCC4CF8.asc

3. Update the package lists
   apt-get update
4. Finally, install PostgreSQL as usual
   apt-get install postgresql
5. You may install another version (e.g. 9.2), using:
   apt-get install postgresql-9.2


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