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 [...]
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. [...]
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 [...]
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 [...]
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, [...]
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 [...]
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 [...]
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 [...]
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. [...]
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 [...]