CREATE TABLE table_66284 ("Heat" FLOAT, "Lane" FLOAT, "Name" TEXT, "Nationality" TEXT, "Time" TEXT)

What is the lowest heat number for a swimmer with a time of 2:34.94?
SELECT MIN("Heat") FROM table_66284 WHERE "Time" = '2:34.94'
SELECT MIN("Heat") FROM "table_66284" WHERE "Time" = '2:34.94'