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SQL Anywhere 10.0.1 » SQL Anywhere Server - SQL Usage » Query Optimization and Execution » Query execution algorithms » Grouping algorithms

Hash Group By Sets algorithm Next Page

Ordered Group By algorithm

The Ordered Group By algorithm reads an input that is ordered by the grouping columns. As each row is read, it is compared to the previous row. If the grouping columns match, then the current group is updated; otherwise, the current group is output and a new group is started.