Question: When did  Ludwig van Beethoven (the one that plays the instrument piano) become a student of Joseph Haydn?
Choices:
1968
2001-01-13
1992-07-25
2017-02-22
2000-06-14
1992-03-03
1792
1907-01-01
1979-10-01
1788-07-26
Program:
function: Find
inputs: piano
function: Relate
dependencies: 0
inputs: instrument
backward
function: Find
inputs: Ludwig van Beethoven
function: And
dependencies: 1
2
function: Find
inputs: Joseph Haydn
function: QueryRelationQualifier
dependencies: 3
4
inputs: student of
start time
SPARQL: SELECT DISTINCT ?qpv WHERE { ?e_1 <pred:name> "Ludwig van Beethoven" . ?e_1 <instrument> ?e_3 . ?e_3 <pred:name> "piano" . ?e_2 <pred:name> "Joseph Haydn" . ?e_1 <student_of> ?e_2 . [ <pred:fact_h> ?e_1 ; <pred:fact_r> <student_of> ; <pred:fact_t> ?e_2 ] <start_time> ?qpv .  }
Answer: 1792