Article · Wikipedia archive · Last revised May 28, 2026

Join selection factor

Within computing, author O'Connell defines join selection factor as "[t]he percentage of records in one file that will be joined with records of another file". This can be calculated when two database tables are to be joined. It is primarily concerned with query optimization.

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Within 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".1 This can be calculated when two database tables are to be joined. It is primarily concerned with query optimization.

References

References

  1. O'Connell, S. (2005) Advanced Databases Course Notes, Southampton, University of Southampton, section 5.10