Mysql insert random datetime in a given datetime range

Question

With SQL , Can I insert random datetime values in a column giving a range?

For example, given a range of 2010-04-30 14:53:27 to 2012-04-30 14:53:2

Answer 1

This works perfectly even for leap years:

select from_unixtime(
    unix_timestamp('2000-1-1') + floor(
        rand() * (
            unix_timestamp('2010-12-31') - unix_timestamp('2000-1-1') + 1
        )
    )
)

The idea is simple: Just take a random timestamp between the two timestamps, then convert it to a datetime using from_unixtime. This way you can ensure that each option has equal probability.

Answer 2

Easiest way out:

INSERT INTO `sometable` VALUES (SELECT timestamp('2010-04-30 14:53:27') - INTERVAL FLOOR( RAND( ) * 366) DAY);

Answer 3

SET @MIN = '2019-06-29 00:53:27';
SET @MAX = '2019-06-29 13:53:27';

UPDATE tablename
SET columnname = TIMESTAMPADD(SECOND, FLOOR(RAND() * TIMESTAMPDIFF(SECOND, @MIN, @MAX)), @MIN)
WHERE `columnname` = condition

Answer 4

This worked for me but my issue was a bit different. I had to assign certain values in a column to a random datetime.

    UPDATE Tablename
    SET columnName = addtime(concat_ws(' ','2018-07-25' + interval rand()*2 day 
    ,'00:00:00'),sec_to_time(floor(0 + (rand() * 86401))))
    WHERE columnName = condition;

Answer 5

This should work nicely:

SET @MIN = '2010-04-30 14:53:27';
SET @MAX = '2012-04-30 14:53:27';
SELECT TIMESTAMPADD(SECOND, FLOOR(RAND() * TIMESTAMPDIFF(SECOND, @MIN, @MAX)), @MIN);

TIMESTAMPDIFF is used to determine the number of seconds in the date range. Multiply this by a random number between 0-1 results in a random number between 0 and the number of seconds in the range. Adding this random number of seconds to the lower bound of the range results in a random date between the data range bounds.

Answer 6

Just try :

SELECT TIMESTAMP('2012-04-30 14:53:27')-INTERVAL RAND()*365*2 DAY INTO tbl_name;