To clarify - the contracting company that looks after/develops this application has already begun migrating the entire system from IIS+PHP & SQL Server to Apache+PHP & PostgreSQL.

Looking to use an open source general-purpose database? This extensive comparison of MySQL vs. PostgreSQL explores the strengths and weaknesses of each.

One of the most interesting trends in the computer world during the past few years has been the rapid growth of NoSQL databases. The term may be accurate, in that NoSQL databases don't use SQL in ...