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org.apache.derby.catalog
Interface Statistics

- 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.
| Method Summary | |
double |
selectivity(java.lang.Object[] predicates)
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| Method Detail |
selectivity
public double selectivity(java.lang.Object[] predicates)
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JAVADOC