Help:SPARQL

SPARQL is the query language used by the query service.

You can read more about SPARQL here, on Wikidata. This has different parts:

• tutorial
• Building a Query examples
• very very very many examples on Wikidata -- this is the best way to learn, at least for me
• Wikidata Query Service user manual, which includes an explication of the 'label' service
• a description of the different views on results that are possible; note that each view expects the data to arrive for each row in a specific order as a tuple, even bound to a variable of fixed name
• a gentle introduction to the Wikidata Query Service

Specifics here

On this site, it is customary to use some prefixes:

PREFIX pdio: <https://wiki.personaldata.io/entity/>
PREFIX pdiot: <https://wiki.personaldata.io/prop/direct/>
PREFIX pdiop: <https://wiki.personaldata.io/prop/>
PREFIX pdiops: <https://wiki.personaldata.io/prop/statement/>
PREFIX pdiopq: <https://wiki.personaldata.io/prop/qualifier/>

This replicates the same prefix scheme for Wikidata (see also here).