A database is a collection of related data which represents some aspect of the real world.  

.NET is a Microsoft operating system platform that incorporates applications.  

J2EE is a platform -independent, Java -centric environment from Sun for developing, building and deploying Web-based enterprise applications online  

MySQL is an Oracle-backed open source relational database management system ( RDBMS) based on Structured Query Language ( SQL ).  

Oracle DB is one of the most trusted and widely-used relational database engines.  

PHP is an HTML-embedded Web scripting language.  

Sql server dba training helps to gain you the knowledge on sql  

Testing is finding out how well something works.