Table: airport_cargo_2
Columns: rank
airport
code_iata_icao
total_cargo_metric_tonnes
change

Question: 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?
SQL: SELECT SUM("total_cargo_metric_tonnes") FROM airport_cargo_2 WHERE "code_iata_icao" = 'pvg/zspd' AND "rank" < 3