What is PostgreSQL and what are some alternative relational databases?
PostgreSQL is a powerful, free, open source Relational Database Management System (RDBMS).
Other popular relational databases include MySQL (also free), SQL Server by Microsoft, and Oracle by Oracle Corporation.
What are some advantages of learning a relational database?
data integrity, unlikely for data corruption
most widely used, many developers use
What is one way to see if PostgreSQL is running?
sudo service postgresql status