จำนวนนักปั่นจักรยานจากฮีต 2 เป็นเท่าใด ?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
what was the number of cyclists from heat 2 ?It is not neccessary to use all the tables.
 table_204_155:  id [ number]  "rank" [ number]  "heat" [ number]  "athlete" [ text]  "nationality" [ text]  "time" [ number]  "notes" [ text] 
SELECT COUNT(*) FROM table_204_155 WHERE "heat" = 2