# Common prefixes across all queries
PREFIX :	<http://example.com/ins_uebung/#>
PREFIX rdf:	<http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX xsd:	<http://www.w3.org/2001/XMLSchema#>
PREFIX rdfs:	<http://www.w3.org/2000/01/rdf-schema#>
PREFIX foaf:	<http://xmlns.com/foaf/0.1/>
PREFIX rev:	<http://purl.org/stuff/rev#>

# How many consoles did Nintendo produce?
SELECT COUNT(?console) AS ?numConsoles
WHERE {
  ?console :madeBy ?organization .  
}
GROUP BY ?organization

# Which console(s) made by Nintendo came out after 1997?
SELECT ?console
WHERE {
  ?console :madeBy :Nintendo .
  ?console :releaseYear ?releaseYear .  
  FILTER(?releaseYear > 1997)
}

# About which consoles do we not know their number of supported controllers yet if they are NOT portable game consoles?
SELECT ?console
WHERE {
  ?console rdf:type :GameConsole .
  FILTER NOT EXIST { ?console rdf:type :PortableGameConsole . }
  FILTER NOT EXIST { ?console :numOfSupportedControllers ?anyNumber . }  
}

# Is there a game console without a review?
ASK {
  ?console rdf:type :GameConsole .
  FILTER NOT EXIST { ?console rev:hasReview ?anyReview . }
}

# Show all Consoles that have at least one review
SELECT DISTINCT ?console
WHERE {
  ?console rev:hasReview ?anyReview .
}

# Construct triples for something different
# Map CEO to consoles
CONSTRUCT {
  ?ceo :isRelatedToConsole ?console .
}
WHERE {
  ?console rdf:type :GameConsole .
  ?console :madeBy  ?org .
  ?org :ceo ?ceo .
  ?ceo rdf:type foaf:Person .
}