| 000 | 08533nam a22008051i 4500 | ||
|---|---|---|---|
| 001 | 8168882 | ||
| 003 | IEEE | ||
| 005 | 20200413152929.0 | ||
| 006 | m eo d | ||
| 007 | cr cn |||m|||a | ||
| 008 | 171212s2018 caua foab 000 0 eng d | ||
| 020 |
_a9781681730325 _qebook |
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| 020 |
_z9781681730318 _qprint |
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| 024 | 7 |
_a10.2200/S00805ED1V01Y201709DTM046 _2doi |
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| 035 | _a(CaBNVSL)swl00408022 | ||
| 035 | _a(OCoLC)1015314933 | ||
| 040 |
_aCaBNVSL _beng _erda _cCaBNVSL _dCaBNVSL |
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| 050 | 4 |
_aQA76.9.D3 _bA372 2018 |
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| 082 | 0 | 4 |
_a005.7565 _223 |
| 100 | 1 |
_aAfrati, Foto, _eauthor. |
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| 245 | 1 | 0 |
_aAnswering queries using views / _cFoto Afrati, Rada Chirkova. |
| 264 | 1 |
_a[San Rafael, California] : _bMorgan & Claypool, _c2018. |
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| 300 |
_a1 PDF (xix, 215 pages) : _billustrations. |
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| 336 |
_atext _2rdacontent |
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| 337 |
_aelectronic _2isbdmedia |
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| 338 |
_aonline resource _2rdacarrier |
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| 490 | 1 |
_aSynthesis lectures on data management, _x2153-5426 ; _v# 46 |
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| 538 | _aMode of access: World Wide Web. | ||
| 538 | _aSystem requirements: Adobe Acrobat Reader. | ||
| 500 | _aPart of: Synthesis digital library of engineering and computer science. | ||
| 504 | _aIncludes bibliographical references (pages 201-213). | ||
| 505 | 0 | _a1. Queries and views -- 1.1 Views -- 1.2 Using views in database systems -- 1.2.1 Views and use cases -- 1.2.2 Views and technical issues -- 1.3 Answering queries using views -- 1.3.1 Producing all the answers--equivalent rewritings -- 1.3.2 Producing a subset of the answers--contained rewritings -- 1.3.3 Data exchange -- 1.4 Relational databases and queries -- 1.4.1 Conjunctive queries -- 1.4.2 Conjunctive queries with arithmetic comparisons (CQAC) -- 1.4.3 Conjunctive queries with negation (CQN) -- 1.4.4 Unions of conjunctive queries -- 1.4.5 Conjunctive queries with aggregation (CQA) -- 1.5 The structure of the book -- 1.6 Exercises -- | |
| 505 | 8 | _a2. Query containment and equivalence -- 2.1 CQ query containment -- 2.1.1 Containment mapping and homomorphisms: canonical database -- 2.1.2 Query evaluation vs. query containment -- 2.2 CQAC query containment -- 2.2.1 Multiple containment mappings and normalization: set of canonical databases -- 2.2.2 When normalization is not needed -- 2.2.3 When single mapping suffices - the homomorphism property: AC-canonical databases -- 2.3 CQN query containment -- 2.3.1 Set of canonical databases -- 2.4 CQA query containment and equivalence -- 2.4.1 MAX queries -- 2.4.2 SUM queries -- 2.4.3 More general aggregate operators -- 2.5 Acyclic CQs -- 2.5.1 Definition of acyclic queries and special cases -- 2.5.2 Efficient algorithm for checking query containment -- 2.5.3 Efficient algorithm for query evaluation -- 2.6 Query equivalence -- 2.7 Containment and equivalence for unions of queries -- 2.8 Exercises -- | |
| 505 | 8 | _a3. Finding equivalent rewritings -- 3.1 Preliminaries -- 3.1.1 Expansion of a rewriting -- 3.1.2 Contained rewritings -- 3.2 CQ queries and views -- 3.2.1 Canonical rewritings and the naive algorithm -- 3.2.2 Properties of the expansion -- 3.2.3 Algorithm corecover -- 3.3 Acyclic CQ views -- 3.4 CQAC queries and views -- 3.4.1 Algorithms for finding equivalent rewritings for queries and views with ACs -- 3.4.2 When the homomorphism property holds -- 3.5 Rewriting CQN queries using CQN views -- 3.6 CQA queries -- 3.6.1 Unfoldings of rewritings -- 3.6.2 Equivalence of unfoldings and rewritings -- 3.6.3 Constructing central rewritings -- 3.6.4 Non-central rewritings -- 3.7 Exercises -- | |
| 505 | 8 | _a4. Maximally contained rewritings (MCRs) -- 4.1 Preliminaries -- 4.1.1 CQAC queries and views -- 4.2 Finding MCRs for CQ queries and views: the MS algorithm -- 4.2.1 Finding MCDs -- 4.2.2 Property of MCDs -- 4.2.3 Combining MCDs--most relaxed rewriting -- 4.3 CQACs, the homomorphism property, extending algorithm MS -- 4.3.1 Exportable and distinguishable variables of an expansion -- 4.3.2 AC-MCDs -- 4.3.3 Combining AC-MCDs and MCDs, and adding ACs -- 4.4 Datalog -- 4.4.1 Definition of the datalog language -- 4.4.2 Views that are unions of CQs -- 4.4.3 Rewriting datalog queries-the inverse-rule algorithm -- 4.4.4 CQAC-SI queries and views -- 4.5 Exercises -- | |
| 505 | 8 | _a5. Answering queries in presence of dependencies -- 5.1 Preliminaries -- 5.1.1 The chase -- 5.1.2 Weakly acyclic sets of Tgds -- 5.1.3 Property of the chase -- 5.2 Query containment under dependencies -- 5.3 Equivalent rewritings -- 5.3.1 Algorithm for CQ queries, views, and rewritings -- 5.3.2 Finding equivalent rewritings for weakly acyclic LAV dependencies -- 5.4 MCRs -- 5.4.1 Functional dependencies need recursion -- 5.4.2 Inverse-rule algorithm for finding MCRs in presence of Egds -- 5.5 Exercises -- | |
| 505 | 8 | _a6. Answering queries in data exchange -- 6.1 Complete data exchange -- 6.2 Data exchange with arithmetic comparisons -- 6.2.1 Dependencies with arithmetic comparisons -- 6.2.2 The AC-chase -- 6.2.3 Solutions and universal solutions -- 6.2.4 Solutions and conjunctive queries -- 6.2.5 Query answering -- 6.2.6 When the homomorphism property holds--preliminaries -- 6.2.7 Succinct AC-chase -- 6.2.8 Computing certain answers using succinct AC-chase -- 6.3 Incomplete data exchange -- 6.3.1 Incomplete instances -- 6.3.2 The IDE setting and the corresponding CDE settings -- 6.3.3 Computing certain answers in IDE settings -- 6.4 Exercises -- | |
| 505 | 8 | _a7. Answering queries using views -- 7.1 Certain answers for queries in presence of view instances -- 7.1.1 Closed vs. open world assumption -- 7.1.2 Certain answers vs. MCRs -- 7.2 Determinacy -- 7.2.1 Definitions and preliminaries -- 7.2.2 Path queries--single view -- 7.2.3 Path queries--CQ is almost complete for rewriting -- 7.2.4 Chain queries -- | |
| 505 | 8 | _a8. Bibliographical notes -- 8.1 Query containment -- 8.1.1 Query containment--set semantics -- 8.1.2 Query containment--bag semantics, aggregation -- 8.1.3 Acyclicity -- 8.2 Query rewriting -- 8.2.1 Binding patterns -- 8.3 Dependencies--the chase -- 8.4 Data exchange -- 8.5 Other related work -- 8.5.1 Determinacy -- 8.5.2 More recent related work -- | |
| 505 | 8 | _a9. Conclusion -- Bibliography -- Authors' biographies. | |
| 506 | _aAbstract freely available; full-text restricted to subscribers or individual document purchasers. | ||
| 510 | 0 | _aCompendex | |
| 510 | 0 | _aINSPEC | |
| 510 | 0 | _aGoogle scholar | |
| 510 | 0 | _aGoogle book search | |
| 520 | 3 | _aThe topic of using views to answer queries has been popular for a few decades now, as it cuts across domains such as query optimization, information integration, data warehousing, website design, and, recently, database-as-a-service and data placement in cloud systems. This book assembles foundational work on answering queries using views in a self-contained manner, with an effort to choose material that constitutes the backbone of the research. It presents efficient algorithms and covers the following problems: query containment; rewriting queries using views in various logical languages; equivalent rewritings and maximally contained rewritings; and computing certain answers in the data-integration and data-exchange settings. Query languages that are considered are fragments of SQL, in particular, select-project-join queries, also called conjunctive queries (with or without arithmetic comparisons or negation), and aggregate SQL queries. | |
| 530 | _aAlso available in print. | ||
| 588 | _aTitle from PDF title page (viewed on December 12, 2017). | ||
| 650 | 0 | _aQuerying (Computer science) | |
| 653 | _aconjunctive queries | ||
| 653 | _aaggregate queries | ||
| 653 | _aarithmetic comparisons | ||
| 653 | _anegation | ||
| 653 | _aacyclic queries | ||
| 653 | _aquery containment | ||
| 653 | _aquery equivalence | ||
| 653 | _aequivalent query rewritings | ||
| 653 | _amaximally contained query rewritings | ||
| 653 | _atuple-generating dependencies | ||
| 653 | _aequality-generating dependencies | ||
| 653 | _athe chase algorithm query containment and rewriting under dependencies | ||
| 653 | _adata exchange | ||
| 653 | _adeterminacy | ||
| 655 | 0 | _aElectronic books. | |
| 700 | 1 |
_aChirkova, Rada Y., _eauthor. |
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| 776 | 0 | 8 |
_iPrint version: _z9781681730318 |
| 830 | 0 | _aSynthesis digital library of engineering and computer science. | |
| 830 | 0 |
_aSynthesis lectures on data management ; _v# 46. _x2153-5426 |
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| 856 | 4 | 2 |
_3Abstract with links to resource _uhttp://ieeexplore.ieee.org/servlet/opac?bknumber=8168882 |
| 999 |
_c562350 _d562350 |
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