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OCA Oracle Database SQL Expert Exam Guide by Steve O'Hearn

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16Hierarchical Retrieval

CERTIFICATION OBJECTIVES

16.01 Interpret the Concept of a Hierarchical Query

16.02 Create and Format Hierarchical Data

16.03 Exclude Branches from the Tree Structure

Image Two-Minute Drill

Q&A Self Test

This chapter discusses the hierarchical query which is based on data structured in a self-join table or view. The hierarchical query uses clauses in the SELECT statement to create a dynamic, tree-structured report appropriate for corporate organization charts, a distribution chain, family genealogy research, or any situation that requires a multilevel data structure.

CERTIFICATION OBJECTIVE 16.01Interpret the Concept of a Hierarchical ...

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