Tell me the sum of longitude for diameter being 22.6 and latitude less than -12.4
CREATE TABLE "c" (
  "name" text,
  "latitude" real,
  "longitude" real,
  "diameter_km" real,
  "named_after" text
);
SELECT SUM("longitude") FROM "c" WHERE "diameter_km"=22.6 AND "latitude"<-12.4;