Table: airports_4
Columns: city
country
iata
icao
airport

Question: What kind of  IATA has an Airport of hamburg airport?
SQL: SELECT "iata" FROM airports_4 WHERE "airport" = 'hamburg airport'

Question: Which Country that has a IATA of bal?
SQL: SELECT "country" FROM airports_4 WHERE "iata" = 'bal'

Question: Which Country has a IATA of vie?
SQL: SELECT "country" FROM airports_4 WHERE "iata" = 'vie'

Question: WHich Country has a ICAO of ltcd?
SQL: SELECT "country" FROM airports_4 WHERE "icao" = 'ltcd'

Question: Which Airport has a IATA of erz?
SQL: SELECT "airport" FROM airports_4 WHERE "iata" = 'erz'

Question: What kind of IATA that has a Airport of berlin schönefeld airport?
SQL: SELECT "iata" FROM airports_4 WHERE "airport" = 'berlin schönefeld airport'