query: #Number of journals by publisher
  
  SELECT ?publisherLabel (COUNT(?journal) AS ?count) WHERE {
    
    ?journal wdt:P123 ?publisher.      # define variable publisher
    ?journal wdt:P31 wd:Q5633421.      # item is journal
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
  }
  GROUP BY ?publisherLabel 
  ORDER BY DESC (?count )