Locate "Oracle," click on it and then click "Application Development." Start the "SQL Plus" program by clicking on it. SQL Plus opens a dialog box for logging into your Oracle database.

ONLC Training Centers offers an Oracle Database: SQL Fundamentals course that covers the fundamentals of SQL, including basic syntax to intermediate query optimization.

Some of the best open source SQL Clients for Database Management are Sqlectron, SQuirrel SQL client, SQL Chat, OmniDB, HeidiSQL,Falcon, etc.