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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.catalog

Source Cross Reference

Class Diagram

Java Document (Java Doc)

org.apache.derby.catalog .Statistics

All known Subclasses: org.apache.derby.catalog.types .StatisticsImpl,
Statistics
public interface Statistics (Code)

This interface is used in the column SYS.SYSSTATISTICS.STATISTICS. It encapsulates information collected by the UPDATE STATISTICS command and is used internally by the Cloudscape optimizer to estimate cost and selectivity of different query plans.

Method Summary
double selectivity(Object[] predicates)

Method Detail
selectivity
double selectivity(Object[] predicates)(Code)
the selectivity for a set of predicates.

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