val query8 = for {
  ((r, rp), p) <- Radnik leftJoin Radproj on (_.mbr === _.mbr) leftJoin Projekat on (_._2.spr === _.spr)
  if List(ime.map(r.ime === _), prz.map(r.prz === _), spr.map(rp.spr === _)).collect { case c if c.isDefined => c.get           }.reduceLeft(_ || _)
} yield (r.ime, r.prz, p.nap)