"For most companies, cost will be a major determining factor in
the selection of a database. On the commercial side, the low end of
the price range includes desktop database products such as
Microsoft Access and FileMaker Pro, which we won't cover in this
article. On the high end of the price range, and offering more
robust features, are the big names such as Oracle and IBM's DB2.
Microsoft?s SQL Server falls somewhere in the middle.
"The open source side offers some surprisingly attractive
choices?surprising in the sense that they are mostly full-featured
RDBMS systems available either for free or at a low cost. MySQL and
PostgreSQL are the most prominent of these database