code feat

 Q.)  What is SQL ? Ans.) SQL(Structured Query Language) is a standardized language to communicate with the database.  With the help of it we can retrieve data from the database. SQL not only allows us to read the data but also allows us to write the data in the database.  Data in the database is stored in the form of tables. We can Select, Insert, Update, Delete, Create, Alter, Drop and can perform many more operations on the table. And these are called as SQL Statements. * SQL Statements are classified mainly into 4 categories :- 1) DML (Data Manipulation Language) 2) DDL (Data Definition Language) 3) DCL (Data Control Language) 4) TCL (Transaction Control Language) * Under DML we have :-(No Autocommit) 1. Select  2. Insert  3. Update  4. Delete  5. Merge    * Under DDL :-(Allows Autocommit) 1. Create 2. Alter  3. Drop  4. Truncate  5. Flashback * Under DCL :-(Allows Autocommit) 1. Grant  2. Revoke  * Under TCL :-(No Autocommit) 1. Commit 2. Rollback 3. Save point From above, we ca