CREATE TABLE "leaders_in_the_northern_ireland_assembel" (
  "leader" text,
  "party" text,
  "leader_s_seat" text,
  "number_of_seats" real,
  "leader_since" text
);

Question: Which leader has been a leader since 2007?
SQL: SELECT "leader" FROM "leaders_in_the_northern_ireland_assembel" WHERE "leader_since"='2007';

Question: How many seats does leader Raymond McCartney have?
SQL: SELECT SUM("number_of_seats") FROM "leaders_in_the_northern_ireland_assembel" WHERE "leader"='raymond mccartney';

Question: Which leader of the Democratic Unionist party has more than 8 seats?
SQL: SELECT "leader" FROM "leaders_in_the_northern_ireland_assembel" WHERE "number_of_seats">8 AND "party"='democratic unionist party';