boguh query
public text v1 · immutableselect D.DiskTitel from Disk D
where D.DiskID in
(select M.DiskID from Musikstueck M
where M.Titel = I love you and
M.DiskID in
(select I.DiskID from Interpret I
where I.Instrument = Triangel and I.StueckID = M.StueckID))