How to SELECT data from table only recorded the last three days

Question

I recorded data in field 'date' by mysql NOW() function. I want to SELECT data which recorded the last three days(today, yesterday and the day before yesterday),but no idea to do this.

SELECT * FROM tlb_students WHERE date ...?... ORDER BY date DESC LIMIT 20

Answer 1

WHERE date >= ( CURDATE() - INTERVAL 3 DAY )

Answer 2

SELECT * 
FROM tlb_students 
WHERE date >= NOW() - INTERVAL 3 DAY
ORDER BY date DESC
LIMIT 20

Answer 3

WHERE date >= subdate(NOW(), 2) 

Answer 4

Another way to do it is:

SELECT * FROM tlb_students WHERE date < DATE_ADD(CURDATE(),INTERVAL -3 DAY)