SELECT * FROM table WHERE TheNameOfTimestampColumn > '2009-01-28 21:00:00'
SELECT * FROM table WHERE TheNameOfTimestampColumn > DATE_SUB(CURRENT_TIMESTAMP, INTERVAL 1 DAY)
SELECT * FROM table WHERE TheNameOfTimestampColumn > '2009-01-28 21:00:00'
SELECT * FROM table WHERE TheNameOfTimestampColumn > DATE_SUB(CURRENT_TIMESTAMP, INTERVAL 1 DAY)