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Uses aggregates to apply expressions over groups of solutions (GROUP BY, COUNT, SUM, AVG, MIN) for partitioning results, evaluating projections, and filtering.

SPARQL and Linked Data Homework Exercises

This document contains several "written" and "electronic" homework questions originally from the course "Semantic Web Topics" at LeHigh University. They include: Write a series of [...]

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By |January 20th, 2017|Comments Off on SPARQL and Linked Data Homework Exercises

All Roads Lead To? Experiments With Gephi, Linked Data and Wikipedia

This blog post shares an example using the Semantic Web Import plugin (available for the Gephi visualization tool) to create a rather complex geospatial visualization. [...]

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By |January 13th, 2017|Comments Off on All Roads Lead To? Experiments With Gephi, Linked Data and Wikipedia

Querying the Linked Archives Hub data using SPARQL

This blog post provides a few sample SPARQL queries that can be used as a starting point for exploring an unfamiliar dataset. The queries are [...]

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By |January 16th, 2016|Comments Off on Querying the Linked Archives Hub data using SPARQL

SPARQL Examples for the DCMI/ASIS&T Webinar

These gits were created to demonstrate the SPARQL examples used in the DCMI/ASIS&T webinar, "From 0 to 60 on SPARQL queries in 50 minutes". Each [...]

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By |January 16th, 2016|Comments Off on SPARQL Examples for the DCMI/ASIS&T Webinar

XQuery/SPARQL Tutorial

This page shows how to access a SPARQL endpoint using an interface provided by Talis. Potentially more valuable, it also provides several dozen example queries, [...]

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By |January 16th, 2016|Comments Off on XQuery/SPARQL Tutorial

Querying Linked Data

This presentation looks in detail at SPARQL and introduces approaches for querying and updating semantic data. It covers the SPARQL algebra, the SPARQL protocol, and [...]

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By |September 15th, 2015|Comments Off on Querying Linked Data

0 to 60 on SPARQL queries in 50 minutes

This links to the PDF version of Ethan Gruber's webinar, which provides an introduction to SPARQL, a query language for RDF. Users will gain hands-on [...]

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By |August 13th, 2015|0 Comments

Introduction to SPARQL

A simple (yet thorough) introduction to SPARQL query language based on the W3C documentation. Focuses on aspects of the query language present in SPARQL 1.0 [...]

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By |August 13th, 2015|0 Comments

Simple SPARQL Tutorial: Using SUM and AVG

Building on the previous tutorial in the series and its discussion of the COUNT keyword, this tutorial explains several other mathematical functions of SPARQL queries. [...]

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By |August 13th, 2015|0 Comments

Simple SPARQL Tutorial: Counting with COUNT

Tutorial explaining how the COUNT keyword allows one to determine the number of triples present in a dataset. Also shows how to use COUNT to [...]

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By |August 13th, 2015|0 Comments