The Constructive method for query containment checking (extended version)
We present a new method that checks Query Containment for queries with negated derived atoms and/or integrity constraints. Existing methods for Query Containment checking that deal with these cases do not check actually containment but another related property called uniform containment, which is a...
| Autores: | , , |
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| Tipo de documento: | relatório científico |
| Data de publicação: | 1999 |
| País: | España |
| Recursos: | Universitat Politècnica de Catalunya (UPC) |
| Repositório: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglês |
| OAI Identifier: | oai:upcommons.upc.edu:2117/93040 |
| Acesso em linha: | https://hdl.handle.net/2117/93040 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Query containment Uniform containment Àrees temàtiques de la UPC::Informàtica::Sistemes d'informació |
| Resumo: | We present a new method that checks Query Containment for queries with negated derived atoms and/or integrity constraints. Existing methods for Query Containment checking that deal with these cases do not check actually containment but another related property called uniform containment, which is a sufficient but not necessary condition for containment. Our method can be seen as an extension of the canonical databases approach beyond the class of conjunctive queries. |
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