Here is a comparison of these 3 database servers. The versions compared are MySQL (4.x), Postgresql (8.x), MS SQL Server 2000. In MySQL 5 version, many useful enterprise database features are expected and hence some feature discussion for MySQL refers to version 5 and use of specific engines.

The information below is a quick comparison collated in one place from the internet. It should be taken as a first level guide for further decision making in choosing the right database for one's needs.