Tractability conditions for direct access to conjunctive query answers extend to semiring-annotated databases with common aggregates when annotations are excluded from the order, with a matching condition established for count-distinct.
Tight fine-grained bounds for direct access on join queries
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Direct Access for Answers to Conjunctive Queries with Aggregation
Tractability conditions for direct access to conjunctive query answers extend to semiring-annotated databases with common aggregates when annotations are excluded from the order, with a matching condition established for count-distinct.