user: ### NOW ANSWER:
Question: What's the service number of the Jammu Duronto train? 
Columns: ['Service', 'Train number', 'Train name', 'Source', 'Departure', 'Destination', 'Arrival']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 12213.0, 'Sarai Rohilla Duronto', 'Yesvantpur Junction', '23:40', 'Delhi Sarai Rohilla', '06:50']
SQL:

assistant: SELECT MAX("Service") FROM "Table" WHERE "Train name" = 'Jammu Duronto';