What is oracle? How many types in that , what is that? How can I learn?

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Oracle is a database administration program by the company of the same name.
More here: Oracle Tutorial - A Beginners Guide (http://www.smart-soft.co.uk/tutorial.htm)
And here: Oracle Corporation - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Oracle_Corporation)

Oracle is the name of the database management solution from a corporation named oracle INc based out of USA.

To find more details visit:

New Oracle DBA (http://neworacledba.blogspot.com/)

You can start with Oracle Databases here...

Database 11g | Oracle Database 11g | Oracle (http://www.oracle.com/database/index.html)

Another good place to start is Oracle Concepts

Contents (http://download.oracle.com/docs/cd/B28359_01/server.111/b28318/toc.htm)

Oops !

Oracle is a company based in AustraliaOracle is as American as apple pie.

Okay I apologize for wrong info about Oracles HQ!
Thanks NeedKarma for mentioning it!