Metropolitan cities of Italy

Columns: Metropolitan city | Area ( km² ) | Population | Population Density ( /km² ) | Date | Mayor
Rome Roma | 5,352 | 4,336,915 | 810 | 3 April 2014 | Virginia Raggi ( M5S ) | Milan Milano | 1,575 | 3,190,340 | 2,026 | 3 April 2014 | Giuseppe Sala ( PD ) | Naples Napoli | 1,171 | 3,128,702 | 2,672 | 3 April 2014 | Luigi De Magistris ( DemA ) | Turin Torino | 6,829 | 2,293,340 | 336 | 3 April 2014 | Chiara Appendino ( M5S ) | Palermo Palermo | 5,009 | 1,276,525 | 255 | 4 August 2015 | Leoluca Orlando ( Independent ) | Bari Bari | 3,821 | 1,251,004 | 327 | 3 April 2014 | Antonio Decaro ( PD ) | Catania Catania | 3,574 | 1,116,168 | 312 | 4 August 2015 | Salvo Pogliese ( FI )

Example questions:
What job did the mayor of a Metropolitan city of Italy with the highest population density do before being mayor ? | Which islands are included in the area that has a mayor of a Metropolitan city of Italy born 18 March 1972 ? | What is the area of the Metropolitan city of Italy that has been represented by the same mayor on 3 separate occasions ? | When was the party represented by the 39th mayor of a Metropolitan city of Italy founded ? | When was the mayor of a Metropolitan city of Italy with the lowest population density elected ?

Answers:
prosecutor | Aeolian Islands | 5,009 | 4 October 2009 | October 29 , 2014