Not supported yet

pgRDF refuses the following with an error that names the construct. Not supported on the overview page has a workaround for each.

• SERVICE (federated queries)
• FILTER EXISTS and FILTER NOT EXISTS
• LANGMATCHES
• COALESCE, SUBSTR and the other SPARQL functions not listed under FILTER and BIND
• Blank nodes in query patterns
• Sequence paths (p1/p2), negated property sets (!(p)) and nested paths such as (p1/p2)+
• UNION inside OPTIONAL or MINUS, FILTER inside MINUS, and BIND inside a UNION branch
• VALUES or FILTER on the variable of a GRAPH ?g clause
• ORDER BY an expression together with DISTINCT
• LOAD
• RDF-star quoted triples

FROM and FROM NAMED are ignored

FROM <iri> and FROM NAMED <iri> are accepted but have no effect: the query runs over all graphs. Use GRAPH <iri> { … } to choose graphs.

Follow or ask for a feature

• pgRDF issues on GitHub: search for the feature, or open an issue describing what you need.
• CHANGELOG: what changed in each release.
• LATEST.md: the current release.