Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_13 (total_cargo__metric_tonnes_ INTEGER, code__iata_icao_ VARCHAR, rank VARCHAR)

### 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?

### Accurate SQL ###

SELECT SUM(total_cargo__metric_tonnes_) FROM table_name_13 WHERE code__iata_icao_ = "pvg/zspd" AND rank < 3