The concept of Data Base Management System is most important thing in today’s era. It has been used for many software and enterprises application to maintain and operate huge amount of data in secure form. For any Dynamic application like Enterprises or Web application SQL is a key component for DBMS which provides easy and secure way to handle variety of data in different application software. It is also used in Data Mining application for mining the data in well defined form so that an application can use that data according to user’s requirements. In this book we cover basic fundamentals of SQL and also we include an introduction of advanced SQL which is PL/SQL and Cursor which are very useful concept for real time enterprises applications for exchanging , maintain the data from different networks via internet and intranet. The language of book is simple to easily understand for the students and help them to build and maintain different Data Base Systems for various software applications.