query: SELECT   ?school ?schoolLabel (COUNT(?person) AS ?count)
  
  WHERE {
    ?person wdt:P166 wd:Q1316544 .
    ?person wdt:P69  ?school .
    SERVICE wikibase:label {
  		bd:serviceParam wikibase:language "en" .
      
  }
    }
  
  GROUP BY ?school ?schoolLabel
  ORDER BY DESC(?count)