CREATE TABLE "24_hours_of_le_mans_results" (
  "year" real,
  "team" text,
  "co_drivers" text,
  "class" text,
  "laps" real,
  "pos" text,
  "class_pos" text
);

Question: Which Team has a Year smaller than 2007, and a Class of gts?
SQL: SELECT "team" FROM "24_hours_of_le_mans_results" WHERE "year"<2007 AND "class"='gts';

Question: In what year Year has a Co-Drivers of jérôme policand christopher campbell?
SQL: SELECT SUM("year") FROM "24_hours_of_le_mans_results" WHERE "co_drivers"='jérôme policand christopher campbell';