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MgLayer
SelectAggregate
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virtual MgDataReader* MgLayer::SelectAggregate | ( | MgFeatureAggregateOptions * | options | ) | `[virtual]`
Selects groups of features from a feature source and applies filters to each of the groups according to the criteria set in the MgFeatureAggregateOptions argument. If you want to apply the criteria to all features without grouping them, use the MgFeatureService::SelectFeatures Method . See Filters and expressions . .NET Syntax
`virtual MgDataReader SelectAggregate(MgFeatureAggregateOptions options);`
Java Syntax
`virtual MgDataReader SelectAggregate(MgFeatureAggregateOptions options);`
PHP Syntax
`virtual MgDataReader SelectAggregate(MgFeatureAggregateOptions options);`
  Parameters:
  | options | (MgFeatureAggregateOptions) An MgFeatureAggregateOptions instance containing all the criteria and filters required for this select operation.
  Returns: Returns an MgDataReader containing the group values. Exceptions:
  | MgFeatureServiceException |
  | MgInvalidArgumentException |
  | MgFdoException |
Reimplemented from MgLayerBase.

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