user: Question: What is the lowest heat number for a swimmer with a time of 2:34.94?
Columns: ['Heat', 'Lane', 'Name', 'Nationality', 'Time']
Types: ['real', 'real', 'text', 'text', 'text']
Sample row: [5.0, 4.0, 'Rebecca Soni', 'United States', '2:22.17']
SQL:

assistant: SELECT MIN("Heat") FROM "Table" WHERE "Time" = '2:34.94';