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SQL Anywhere 12.0.0 (Français) » SQL Anywhere Server - SQL Usage » Query optimization and execution » Query execution algorithms » Types of algorithms » Query expression algorithms

 

RowReplicate algorithm (RR)

RowReplicate is used during the execution of set operations such as EXCEPT ALL and INTERSECT ALL. It is a feature of such operations that the number of rows in the result set is explicitly related to the number of rows in the two sets being operated on. RowReplicate ensures that the number of rows in the result set is correct. See Performing set operations on query results with UNION, INTERSECT, and EXCEPT.