Class StdDevPAggregator<V extends Number>

java.lang.Object
org.apache.derby.impl.sql.execute.VarPAggregator<V>
org.apache.derby.impl.sql.execute.StdDevPAggregator<V>
All Implemented Interfaces:
Externalizable, Serializable, Aggregator<V,Double,VarPAggregator<V>>

public class StdDevPAggregator<V extends Number> extends VarPAggregator<V>

This class implements the SQL Standard STDDEV_POP() aggregator, computing a population's standard deviation. It relies on VarPAggregator to compute the population variance and then applies the textbook definition of standard deviation:

var_pop()
 
See Also: