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The expression engine provided by FireDAC is a powerful engine used for filtering, indexing, and calculated fields. For more information on how to write powerful expressions, go here: http://docwiki.embarcadero.com/RADStudio/en/Writing_Expressions_(FireDAC).

More information about aggregate and calculated fields can be found here: http://docwiki.embarcadero.com/RADStudio/en/Calculated_and_Aggregated_Fields_(FireDAC).