You posted this on Facebook too, I believe?
Same answer here
You need to create a database, or get one that's already been created for you.
thank you i will develop application with team but i need a way to create database without install oracle database and sql developer in each person, is exist alternative simple IDE ?
The simplest ide (?) is sqlplus, which comes bundled with rdbms software. You should use sqlplus to create database using script or dbca, and then connect to that db using sql developer.
thanks alot , i am not have alternative choice else what you said