Question: Which leader has been a leader since 2007?
SQL: SELECT "Leader" FROM "2-17430092-6" WHERE "Leader since" = '2007';

Question: How many seats does leader Raymond McCartney have?
SQL: SELECT SUM("Number of Seats") FROM "2-17430092-6" WHERE "Leader" = 'Raymond McCartney';

Question: Which leader of the Democratic Unionist Party has more than 8 seats?
SQL: SELECT "Leader" FROM "2-17430092-6" WHERE "Number of Seats" > 8.0 AND "Party" = 'Democratic Unionist Party';