user: Question: what is the venue when the event is 4x400 m relay and the competition is Asian Championships?
Columns: ['Year', 'Competition', 'Venue', 'Position', 'Event']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2001.0, 'World Youth Championships', 'Debrecen , Hungary', '4th', '400 m']
SQL:

assistant: SELECT "Venue" FROM "Table" WHERE "Event" = '4x400 m relay' AND "Competition" = 'Asian Championships';