MYSQL中UNIX时间戳与日期的转换

select FROM_UNIXTIME(1464973385.641,'%Y-%m-%d %H:%i:%s');
select UNIX_TIMESTAMP('2016-06-04 01:03:05');

结果：
FROM_UNIXTIME(1464973385.641,'%Y-%m-%d %H:%i:%s')
2016-06-04 01:03:05

UNIX_TIMESTAMP('2016-06-04 01:03:05')
1464973385