Just tried to move the VALUES clause of the second query inside the WHERE clause and now it gives the same result as the first query. I am using the Query# setValuesDataBlock(...) method to set the values programmatically. Can I control where this method puts the VALUES clause?
Regards, Barry -----Original Message----- From: Nouwt, B. (Barry) <barry.no...@tno.nl.INVALID> Sent: vrijdag 6 mei 2022 17:26 To: users@jena.apache.org Subject: RE: SPARQL question I also tried the two queries below using Virtuoso instead of Apache Jena, but Virtuoso behaves the same with the first query, but gives the following parse error with the second query: Virtuoso S0022 Error SQ200: No column sat. -----Original Message----- From: Nouwt, B. (Barry) <barry.no...@tno.nl.INVALID> Sent: vrijdag 6 mei 2022 17:21 To: users@jena.apache.org Subject: RE: SPARQL question Just found the following Stack Overflow question which looks related: https://stackoverflow.com/questions/56891312/difference-in-performance-between-using-values-keyword-and-using-directly-the-ur Although they talk mostly about the difference in performance between the two approaches and not about the difference in semantics. -----Original Message----- From: Nouwt, B. (Barry) <barry.no...@tno.nl.INVALID> Sent: vrijdag 6 mei 2022 17:16 To: users@jena.apache.org Subject: SPARQL question Hi everyone, two SPARQL queries which I assumed are the same give different results in Apache Jena. The two queries are: SELECT * WHERE { <https://www.tno.nl/kb1/meta/knowledgeinteractions/react/changed/act/requirement> a ?someClass FILTER NOT EXISTS { <https://www.tno.nl/kb2/meta/knowledgeinteractions/post/new/act/satisfaction> a ?someClass } } SELECT * WHERE { ?req a ?someClass FILTER NOT EXISTS { ?sat a ?someClass } } VALUES (?req ?sat) { (<https://www.tno.nl/kb1/meta/knowledgeinteractions/react/changed/act/requirement> <https://www.tno.nl/kb2/meta/knowledgeinteractions/post/new/act/satisfaction>) } Note that the queries are basically the same, but the second query uses the VALUES keyword to bind the ?req and ?sat variables, while the first query replaces the actual ?req and ?sat variables occurrences instead. Does anyone know what I am missing? Best regards, Barry This message may contain information that is not intended for you. If you are not the addressee or if this message was sent to you by mistake, you are requested to inform the sender and delete the message. TNO accepts no liability for the content of this e-mail, for the manner in which you use it and for damage of any kind resulting from the risks inherent to the electronic transmission of messages.
