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union_of_conjunctive_queries (443B)

      1 # Union of conjunctive queries (UCQ)
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      3 [disjunction] of [conjunctive_query] that all have the same [free_variables]
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      5 Also called "existential-positive queries", i.e., [FO] queries using only [existential_quantification] and [disjunction]
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      7 [ucq_to_cq]: techniques to replace UCQs by CQs in hardness proofs
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      9 special case: [hk_queries]
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     11 [UCQ_non_redundant]
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     13 Up: [query_language]
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     15 See also: [uc2rpq]
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     17 Aliases: union of conjunctive query, UCQ, UCQs