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org.apache.derby.catalog
Interface Statistics  

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public interface Statistics

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.

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Method Summary
double	selectivity(java.lang.Object[] predicates)

 

Method Detail

selectivity

public double selectivity(java.lang.Object[] predicates)

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> apache >> derby >> [ catalog overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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