Oracle is a database management system, created by the company of the same name. Oracle is a relational database, of type object-relational.
It is a commercial database management system that requires the payment of expensive licenses. Therefore, it is mainly used at the enterprise level, when the requirements for the database are very high.
Oracle has a free version called Oracle Express Edition, which serves as the entry point for the Oracle database. It is ideal for students learning Oracle, as well as for use in projects that use only free software components.
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