Table: duronto_express
Columns: service
train_number
train_name
source
departure
destination
arrival

Question: What's the service number of the Jammu Duronto train? 
SQL: SELECT MAX("service") FROM duronto_express WHERE "train_name" = 'Jammu Duronto'

Question: What's the name of the train to Madurai Junction?
SQL: SELECT "train_name" FROM duronto_express WHERE "destination" = 'Madurai Junction'

Question: What's the service number of the Pune Duronto train that departures at 21:35?
SQL: SELECT "service" FROM duronto_express WHERE "train_name" = 'Pune Duronto' AND "departure" = '21:35'

Question: What's the name of the train that goes to Bhubaneswar?
SQL: SELECT "train_name" FROM duronto_express WHERE "destination" = 'Bhubaneswar'