Class XII                   Chapter 09 : More on databases and SQL
https://drive.google.com/file/d/0BxdixE-ge8NUa1BwQ1U4Y1NGdE0/view?usp=sharing


Class XII                   Chapter 10 : Advanced RDBMS Concepts
https://drive.google.com/file/d/0BxdixE-ge8NUel9ZWHRWY3NSS3M/view?usp=sharing

 Class XI - Chapter 09 MySQL

https://drive.google.com/file/d/0BxdixE-ge8NUTmd5NnBEU1k5X3c/view?usp=sharing