Can you tell me the sum of Gain that has the Name of kass, rob, and the Avg/g smaller than 1.9?
CREATE TABLE "rushing" (
  "name" text,
  "gain" real,
  "loss" real,
  "long" real,
  "avg_g" real
);
SELECT SUM("gain") FROM "rushing" WHERE "name"='kass, rob' AND "avg_g"<1.9;