Dear All ,
Please clear one thing , OCA is Database administration course to the specified technology, like 10g,11g or 12c. While there is another course which is DBMS( database management system) where students learn how to build their own databases. in OCA we will learn how build/apply SQL quires on already available database. But for this series , i will try with some example company database and we will apply the SQL quires on that. Remember our focus is to learn SQL query. That can be apply on any database system that support SQL standard.