user: Question: What is the total heat number of sun yang, who has a lane less than 2?
Columns: ['Heat', 'Lane', 'Name', 'Nationality', 'Time']
Types: ['real', 'real', 'text', 'text', 'text']
Sample row: [4.0, 4.0, 'Larsen Jensen', 'United States', '3:43.10']
SQL:

assistant: SELECT SUM("Heat") FROM "Table" WHERE "Name" = 'sun yang' AND "Lane" < 2.0;