Insert/ Update random date in MySQL

Question

How would I update a column with a random date in the past 2 weeks using MySQL?

For example (code doesn't actually work):

UPDATE mytable SET col = sysdate() - rand(1, 14); 

Answer 1

You can get a random integer with this expression:

To obtain a random integer R in the range i <= R < j, use the expression FLOOR(i + RAND() * (j - i)). For example, to obtain a random integer in the range the range 7 <= R < 12, you could use the following statement:

SELECT FLOOR(7 + (RAND() * 5)); 

https://dev.mysql.com/doc/refman/8.0/en/mathematical-functions.html#function_rand

Use that to generate a random number of days, hours or minutes (depending on the resolution) and add that number to current date.

Full expression would be:

-- Date only SELECT CURRENT_DATE - INTERVAL FLOOR(RAND() * 14) DAY; 

-- Date and time SELECT CURRENT_TIMESTAMP - INTERVAL FLOOR(RAND() * 14 * 24 * 60 *60) SECOND; 

Demo

Answer 2

UPDATE mytable SET col = CURRENT_DATE - INTERVAL FLOOR(RAND() * 14) DAY 

This sets col to a date between (and including) current date and current date - 13 days. Multiply by 15 to get current date - 14 days.