hannahbast
commented
4 months ago @nikkiwd The QLever UI automatically adds all the prefixes in all situations, whether you are typing, accepting a suggestion, or copying and pasting a query without prefixes from somewhere else. Again, the only reason that happened for your query is because the SELECT is not all uppercase. But this is one issue and not many so I am closing this one.
When I try to write queries in https://qlever.cs.uni-freiburg.de/wikidata/, it's really annoying because I have to manually look up all the prefixes I need. It doesn't even provide a list of common prefixes I can pick from, I have to go to other sites to find out what they should be.
This query, for example, gives the error
Invalid SPARQL query: Prefix skos was not registered using a PREFIX declaration.https://query.wikidata.org/ on the other hand automatically includes a default set of prefixes which covers the vast majority of queries I write, which makes it much easier to use.
Some people have claimed that QLever does automatically add prefixes but it has never done that for me.