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OCA Oracle Database 11g: SQL Fundamentals I: A Real-World Certification Guide by Steve Ries

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Chapter 7. Aggregate Data Transformation

Relational database management systems serve a unique purpose in the world of technology. Databases of all types, from Microsoft Access to large mainframe systems, primarily function to store and manipulate data. Today's databases, particularly Oracle, are capable of storing massive amounts of information. However, storing data in a database is only part of the equation. If the end user cannot see this data presented in a meaningful way, the data loses much of its usefulness. This is why the SQL language is so important. SQL is the primary tool that the relational databases use to extract and present data. SQL makes it possible to sift through enormous amounts of data and highlight exactly the piece of ...

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