Uses UNION to formulate queries with multiple possible graph patterns.
Ordnance Survey Linked Data: Combining Postcode and Spatial Queries
Building on previous blog posts, the author shows how to query and combine data from two different datasets. Although the datasets were published by the [...]
Ordnance Survey Linked Data: A Simple Postcode Query
This blog post shares give some simple examples of what can be done with the Code-Point(R) Open dataset, available as Linked Open Data (LOD). This [...]
Ordnance Survey Linked Data: Simple SPARQL Example
This blog post shares how to retrieve several variables of data from the Ordnance Survey dataset, available as Linked Open Data (LOD). Includes SPARQL queries [...]
SPARQL: Using Operators Tutorial and Quiz
This slide tutorial focuses on using various operators in SPARQL queries. Several examples are provided which include the RDF data being queried, the SPARQL query [...]
Example SPARQL queries
This page, which contains SPARQL tools, tips, sample queries, is just starting out and the authors hope it can become a resource for useful snippets [...]
Updating RDFS ABoxes and TBoxes in SPARQL
Updates in RDF stores have recently been standardized in the SPARQL 1.1 Update specification. However, computing answers entailed by ontologies in triple stores is usually [...]
SPARQL Tutorial: Alternatives in a Pattern
This brief tutorial shows that another way of dealing with the semi-structured nature of RDF data is to query for one of a number of [...]
Simple SPARQL Tutorial: Using the UNION Keyword
Tutorial showing how to modify a query to combine the results of two separate graph patterns (or conditions) using the UNION keyword. The topic is [...]
Simple SPARQL Tutorial: More on SPARQL UNION
Tutorial explaining how the UNION keyword works using RDF principles. Topic is continued from the last video of the series, which showed an example of [...]
Simple SPARQL Tutorial: Subqueries (Queries Inside Queries)
Tutorial explaining how the it is possible to nest one query within another query in order to avoid the queries running independently (and thus returning [...]