1
select from_unixtime(1272945599.90000), from_unixtime(1272945599), from_unixtime("1272945599.90000");
2
from_unixtime(1272945599.90000) from_unixtime(1272945599) from_unixtime("1272945599.90000")
3
2010-05-04 03:59:59.900000 2010-05-04 03:59:59 2010-05-04 03:59:59.900000