===Database===

: Agile database practice [http://www.agiledata.org/essays/bestPractices.html]

:

* Postgre

: Installation: [http://www.postgresql.org/download/]

*The current versions are MySQL 5.1 and PostgreSQL 8.4.

#PostgreSQL is a unified database server with a single storage engine. MySQL has two layers, an upper SQL layer and a set of storage engines. [http://www.wikivs.com/wiki/MySQL_vs_PostgreSQL]

#MySQL began development with a focus on speed while PostgreSQL began development with a focus on features and standards. Thus, MySQL was often regarded as the faster of the two.

# Both PostgreSQL and MySQL support Not-Null, Unique, Primary Key and Foreign Key constraints. However MySQL silently ignores the CHECK constraint