SPARQL query and result for Query 2
How To Write A Query Plan For A Sparql Query In Hadoop
... Listing 2 shows LUBM query 2 and Listing 3 shows its rewritten ...the query result would be of type ub:University and ub:Department ...rewritten query has two less triple ...
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Flexible query processing for SPARQL
... The applyApprox and applyRelax functions, respectively, invoke the functions approxRegex and replaceTriplePattern, shown as Algorithms 4 and 6. In Algorithm 6, z, z 1 and z 2 are fresh new variables. The ...
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SPARQL Query Recommendations by Example
... a SPARQL Query Recommendation Tool (called SQUIRE) based on query reformulation is ...a SPARQL query that is satisfiable ...and result size as the original query and ii) ...
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Scalable Multi-query Optimization for SPARQL
... between SPARQL and relational algebra [2], ...in SPARQL . For instance, the work by P. Roy et al. [27] represented query plans in AND-OR DAGs and used heuristics to partially materialize ...
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SPARQL Query Containment under Schema
... of query evaluation and containment is also ...rule-based query language for RDF(S) ...of query contain- ment over simple RDF graphs, this result is also published in the RDF seman- tics ...
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Learning-based SPARQL Query Performance Prediction
... using query plan as features in our ...the query elapsed time of a large collection of ...prediction result and makes similar works hard to ...experimental query set is larger than theirs, we ...
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SPARQL Query Rewriting with Paths [Master's Thesis]
... the query. Basically, our work is to find for a given query with non-distinguished variables, an equivalent query that does not introduce such ...
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SPARQL Query Optimization for Structural Indexed RDF Data
... and query processing algorithms for data ...that result in the unnecessary processing of intermediate results for SPARQL ...a query optimizer to process queries without join ...conventional ...
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Predicting SPARQL Query Performance and Explaining Linked Data
... Also the concentration of the short running queries near the perfect prediction line is more for k -NN. 5.2 Explanation Summarization Results We evaluate our summarization approach by comparing the summarized expla- ...
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Expressive and Scalable Query-Based Faceted Search over SPARQL Endpoints
... current query, and highlights the current focus, here ...the result table of the current query, with a column for each entity/value in the query (here: writer, nationality, birth date, and ...
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An Approach for Query Decomposition on Federated SPARQL Query Systems
... Traditional query rewriting approaches do not allow performing incomplete translations of a BGP, ...original query, but also collecting complementary information and further applying a data fusion process ...
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Flexible query processing for SPARQL
... a query should be formulated in order to retrieve the desired ...presents query processing algorithms for a fragment of SPARQL ...with query approximation and relaxation operators. Our ...
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Predicting SPARQL Query Performance
... learn SPARQL query performance from previously executed ...model SPARQL queries as feature vectors, and use k -nearest neighbors regres- sion and Support Vector Machine with the nu-SVR kernel to ...
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Extended Query Pattern Graph and Heuristics - based SPARQL Query Planning
... SPARQL as a standard RDF query language is essential for the development of semantic web. As the data in- creasing rapidly , e ffi cient SPARQL query optimizer is expected. Based on this b[r] ...
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SPARQL Query Containment with ShEx Constraints
... in SPARQL provides a way to ask for constraints that are not necessarily applicable, granting flexibility for users to define a common framework for queries even when schemas may differ with different sources, and ...
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SLURP: An Interactive SPARQL Query Planner
... client-side query processing because less expressive LDF interfaces, such as Triple Pattern Fragment (TPF) servers, require the clients to devise ef- ficient query plans to execute SPARQL ...
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Flexible query processing of SPARQL queries
... a query by inserting, deleting or replacing properties, which makes it an ideal candidate for adding to SPARQL ...valid query because of the complexity and heterogeneity of the ...
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Title: A SPARQL QUERY GENERATION MECHANISM ON RDF
... to SPARQL queries on a federation of different ...semantic query languages like RQL, SPARQL, ...semantic query for ...keyword query terms. Using this URIs one can formulate ...
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Towards a Visual SPARQL-DL Query Builder
... the query is more expressive and eas- ier to ...visual query language is an ideal mean for users and ontology engineers for creating queries taking advantage of the easy-to-understand and low time and cost ...
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Sempala: Interactive SPARQL Query Processing on Hadoop
... SQL query engine for Hadoop inspired by Google Dremel [16] and developed by Cloudera, one of the biggest Hadoop dis- tribution ...can query tables created with Hive and vice ...given query, ...
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