As you know, QueryExpression are built as an Object Model. They support all the features of FetchXML except for grouping & aggregates.
FetchXML supports all the features of QueryExpression including grouping & aggregates. Queries here are built as XML statements.
INQ queries are built using standard language similar to SQL, but internally it uses QueryExpression and hence it is limited to the features of QueryExppression
The QueryExpression class supports complex queries. ...(read more)
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