As a complement to my tutorial on inserting data into a PostgreSQL database, we will insert data into a PostgreSQL database in this tutorial. While MySQL is perhaps the most popular database system of the day, particularly for SMBs (small and medium businesses), it is dwarfed in its power and flexibility by PostgreSQL. As mentioned previously, MySQL may be free as in gratis (i.e., cost-free) but it is not free in terms of libre (i.e., ability to modify it). PostgreSQL is free in both aspects and is powerful enough to rival a certain DBMS that begins with an "O".
This tutorial presupposes a basic familiarity with SQL. It will show how to read an entire PostgreSQL database without need for a function or class.