Hi everyone,

During my diploma thesis internship at Merck I created an open-source tool for converting big RDF datasets to RDB (relational database), JSON and other formats. 

Check out chapter 7 to see how I converted a subset of Wikidata to a relational database model and used SQL to get results. The thesis is here: http://davidprihoda.com/rdf2x/Distributed_Conversion_of_RDF_Data_to_the_Relational_Model.pdf

The code is available on github: https://github.com/Merck/rdf2x.

Looking forward to any comments,
David Příhoda