harpist | A Sass and EJS Harp.js boilerplate | Runtime Evironment library
kandi X-RAY | harpist Summary
kandi X-RAY | harpist Summary
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QUESTION
I recently started using SPARQL and have an exercise to make a query that will allow me to get song titles that have a singer as their only vocalist? In this case being John Lennon the only singer.
I have a beatles.ttl data file, so far I was able to select all the songs where John Lennon is lead singer, however there are songs where he is lead singer with 2 other band members.
...ANSWER
Answered 2019-Dec-15 at 22:35The trick is to realize that you can rephrase "John Lennon is the only vocalist" to "none of the vocalists are anyone other than John Lennon". Then you can use FILTER NOT EXISTS
, like so:
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