# Join selection factor

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Within [computing](/source/computing), author O'Connell defines '''join selection factor''' as "[t]''he percentage (or fraction) of records in one file that will be joined with records of another file''".<ref>O'Connell, S. (2005) ''Advanced Databases Course Notes'', Southampton, University of Southampton, section 5.10</ref>  This can be calculated when two [database](/source/database) [tables](/source/Table_(database)) are to be [joined](/source/Join_(SQL)). It is primarily concerned with [query optimization](/source/query_optimization).

== References ==
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Category:Database algorithms

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Adapted from the Wikipedia article [Join selection factor](https://en.wikipedia.org/wiki/Join_selection_factor) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Join_selection_factor?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.