How to retrieve microseconds or milliseconds from MySQL current time?

Question

I am trying to create my first stored function on MySQL. In this function I want to return the timestamp of the current date and time with 3 microsecond digits like this:

Answer 1

Also you can

mysql> select now(3) as millisecond, now(6) as microsecond, round(1000 * unix_timestamp(now(3))) elapsed_millisecond, round(unix_timestamp() * 1000  + MICROSECOND(now(6)) / 1000) elapsed_microsecond;
+-------------------------+----------------------------+---------------------+---------------------+
| millisecond             | microsecond                | elapsed_millisecond | elapsed_microsecond |
+-------------------------+----------------------------+---------------------+---------------------+
| 2019-12-10 11:49:43.568 | 2019-12-10 11:49:43.568767 |       1575949783568 |       1575949783569 |
+-------------------------+----------------------------+---------------------+---------------------+
1 row in set (0.01 sec)

Answer 2

This is my Solution for Millisecond management.

I just use "text" data type as data store, of cause you have to control data validation by yourself.

CREATE TABLE time_test ( id INT NOT NULL AUTO_INCREMENT , start_time TEXT NULL , stop_time TEXT NULL , difference TEXT NULL , ranking INT NULL , PRIMARY KEY ( id ) )

INSERT INTO time_test VALUES (NULL, '10:10:10.111111', '10:10:10.456789',NULL,NULL) INSERT INTO time_test VALUES (NULL, '10:10:10.111111', '10:10:20.777777',NULL,NULL) INSERT INTO time_test VALUES (NULL, '10:10:10.111111', '10:10:01.999999',NULL,NULL)

Now you can calculate like this Now you can calculate like this sorting SELECT * FROM time_test ORDER BY TIME( stop_time )

Calculate time diff, very good for me. SELECT *, TIMEDIFF(stop_time,start_time) from time_test
Calculate time diff, very good for me.

also can calcuate and store back you can cut some string by yourself. update time_test set difference = concat(TIMEDIFF(stop_time,start_time), MICROSECOND(TIMEDIFF(stop_time,start_time) )) also can calcuate and store back you can cut some string by yourself.

you also doing ranking by this command: SET @r:=0;
UPDATE time_test SET ranking= (@r:= (@r+1)) ORDER BY difference ASC; you also doing ranking by this command:

Answer 3

For mysql 5.6

round(unix_timestamp() * 1000  + MICROSECOND(sysdate(6)) / 1000)

Answer 4

MySQL 5.6 supports the millisecond precision in the sysdate function.

try

select sysdate(6) will return 2013-04-16 13:47:56.273434

and

select sysdate(3) will return 2013-04-16 13:47:56.273

Answer 5

Take a look at what MySQL says(http://dev.mysql.com/doc/refman/5.1/en/fractional-seconds.html):

However, when MySQL stores a value into a column of any temporal data type, it discards any fractional part and does not store it.

So you need to store it not as a date value, but as a simple floating point value.