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Define the following database concepts and explain the use/benefits. Equivalent query Query cost Access paths Conjunctive selection Index, nested loop join Using statistics about data
Define the following database concepts and explain the use/benefits.
- Equivalent query
- Query cost
- Access paths
- Conjunctive selection
- Index, nested loop join
- Using statistics about data tables to optimize queries.
- Random sample/sampling
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1 Equivalent Query Equivalent queries are different SQL queries that produce the same result when executed on a given database They are functionally i...
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Database management systems
Authors: Raghu Ramakrishan, Johannes Gehrke, Scott Selikoff
3rd edition
72465638, 978-0072465631
