What is the sum of 1938 values where 1933 values are under 68.3 and 1940 valures are under 4.02?
CREATE TABLE "relief" (
  "table_2_depression_data" text,
  "1929" real,
  "1931" real,
  "1933" real,
  "1937" real,
  "1938" real,
  "1940" real
);
SELECT SUM("1938") FROM "relief" WHERE "1933"<68.3 AND "1940"<4.02;