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Some use a Microsoft RDBMS and some use an Oracle RDBMS. I've been studying to become an Oracle Database SQL Expert and will take the exam in 1 - 2 months.
Oracle Database 21c is the result of four decades of development. Oracle Database was the first commercial SQL-based relational database (1979), implemented based on a published IBM specification.
In 1983, Oracle Version 3, built on the C programming language, is the first RDBMS to run on mainframes, minicomputers and PCs—giving customers the ability to use the software in almost any ...
Apache Hadoop has been a great technology for storing large amounts of unstructured data, but to do analysis, users still need to reference data from existing RDBMS based systems. This topic was ...