SPARQL query to SELECT available Named Graphs

[danielbakas (Daniel B.)]

Hi!!

Quick question on working with Named Graphs

I was performing this query in Stardog Studio

SELECT DISTINCT ?graph
WHERE {
  GRAPH ?graph {
    ?s ?p ?o
  }
}

And I got an empty result, even though our database has many named graphs with many resources.

If I switch to a known named graph and perform a query without the GRAPH term, that works:

But using the GRAPH term does not work.

Is this expected?

Thanks!

[pavel (Pavel Klinov)]

Hi Daniel,

you should define the dataset for the query: either by adding FROM NAMED stardog:context:local or by choosing that stardog:context:local in the graph drop-down list.

Cheers,
Pavel

[danielbakas (Daniel B.)]

Hi @pavel!

The FROM and FROM NAMED queries worked without the GRAPH clause. But using the GRAPH clause still doesn't seem to work.

Might I be missing something?

Here's a screenshot of one failed test I did with the FROM NAMED with the GRAPH clause:

Thing is, I do have data in multiple named graphs as shown in the same SELECT query without the GRAPH clause:

Looking forward to your thoughts.

Thanks!!