This is a topic that can start several hours of discussion. As a quick summary, MySQL is the "easy-to-use, web developer" database, and PostgreSQL is the "feature-rich, standards-compliant" database. PostgreSQL is liberally licensed and owned by its community; MySQL is GPL-licensed and owned by Oracle. Beyond that, each database user should make his own evaluation; open source software makes doing comparisons very easy.
Are the resulting relations of PRODUCT and JOIN operation the same?
How do you communicate with an RDBMS?
Which part of the RDBMS takes care of the data dictionary? How?
What are the primitive operations common to all record management systems?
What are the unary operations in Relational Algebra?
What do you mean by Correlated subquery?
What are database files, control files and log files. How many of these files should a database have at least? Why?
Name the sub-systems of a RDBMS?
What is RDBMS KERNEL?
Define SQL and state the differences between SQL and other conventional programming Languages?
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