What is the full amount of Total Cargo (in Metric Tonnes) where the Code (IATA/ICAO) is pvg/zspd, and the rank is less than 3?
CREATE TABLE "2010_final_statistics" (
  "rank" real,
  "airport" text,
  "code_iata_icao" text,
  "total_cargo_metric_tonnes" real,
  "pct_change" text
);
SELECT SUM("total_cargo_metric_tonnes") FROM "2010_final_statistics" WHERE "code_iata_icao"='pvg/zspd' AND "rank"<3;