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SQL Anywhere 11.0.0 » SQL Anywhere Server - SQL Usage » Query Optimizer » Query optimization and execution » Query execution algorithms


Duplicate elimination algorithms

A duplicate elimination operator produces an output that has no duplicate rows. Duplicate elimination nodes may be introduced by the optimizer, for example, when converting a nested query into a join.

For more information, see HashDistinct algorithm (DistH), and OrderedDistinct algorithm (DistO).

HashDistinct algorithm (DistH)
OrderedDistinct algorithm (DistO)