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Oracle® SQL by Example, Third Edition by Alice Rischert

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Chapter 16. Exploring Data Warehousing Features

This chapter revisits some of the concepts and functionality discussed in previous chapters, namely the DECODE function, the CASE expression, and aggregate functions. You will expand on your existing knowledge and solve more complex queries.

Analytical functions allow you to explore information in ways never imagined before. These functions let you analyze data to determine rankings, perform complex aggregate calculations, and reveal period-to-period changes.

The WITH clause allows you to reuse the query result without having to reexecute the statement; this ...

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