what is the sum of the wkts when the ovrs were bigger than 2 and econ was bigger than 7.84?
CREATE TABLE "twenty20_internationals" (
  "player" text,
  "wkts" real,
  "runs" real,
  "econ" real,
  "ovrs" real
);
SELECT SUM("wkts") FROM "twenty20_internationals" WHERE "ovrs">2 AND "econ">7.84;