[ROOT] / doc / tocInheritance / FunctionKey / FunctionKeyAggregate / __TOCDet

ClassAttribute

Operates over a collection of properties.

Specially understood by ForeignKey.

TryGetP is implicit understood to receive an instance of IP containing an IEnumerable<IP>-collection as value.

Implementing classes in StandardAgoRapideCode, more specific ARCQuery, are:
FunctionKeyAggregateAvg
FunctionKeyAggregateCount
FunctionKeyAggregateDistinct
FunctionKeyAggregateJoin
FunctionKeyAggregateMax
FunctionKeyAggregateMin
FunctionKeyAggregateSingle
FunctionKeyAggregateSum

Implementing classes that returns PValue<List<IP>> are:
FunctionKeyAggregateDistinct
These usually give meaning only if followed by an 'ordinary' implementation that returns a PValue containing a single value.
This is specially understood by TryGetPInternal.
Stored in ForeignKey as AggregateKeys.

See also:
QueryExpressionAggregate which aggregates over a key
and
QueryExpressionPivot which creates a table by querying over two keys.

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Generated 2025-10-31 17:27:10.832 UTC