Hash basics - PowerPoint PPT Presentation

Query execution hashing based Two pass algorithms

Query execution hashing based Two pass algorithms. —Gaurang Patel— (205). Agenda. Terminology Hash Basics Partitioning relation by hashing Hash-based Grouping and Aggregation Union, Intersection and Difference Hash-Join Algorithm Conclusion. Terminology. Query optimization

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Hashes

Hashes. a “hash” is another fundamental data structure, like scalars and arrays. Hashes are sometimes called “associative arrays”. Basically, a hash associates a key with a value. A hash is composed of a set of key-value pairs.

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