I've been working with PHP and mySQL for the past couple years, but haven't really had the 'chance' to explore much further. I see several job listings talk about postgreSQL and msSQL and such.

Community is King Community is king The most striking difference between PostgreSQL and MySQL may not be technical at all. Open-source projects are, by definition, all about the community.

MVCC ensures simultaneous multiple writes without conflicts, which reduces contention and improves throughput in multitenant environments. Compliance MySQL and PostgreSQL both support the SQL standard ...