在 MySQL 中插入/更新随机日期

2021-12-21 00:00:00 random sql date mysql

如何使用 MySQL 在过去 2 周内使用随机日期更新列?

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

例如(代码实际上不起作用):

For example (code doesn't actually work):

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

推荐答案

你可以用这个表达式得到一个随机整数:

You can get a random integer with this expression:

获得一个随机整数R范围 i <= R FLOOR(i + RAND() * (j - i)).为了例如，要获得一个随机整数范围范围 7 <= R <12、你可以使用以下语句:

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

使用它来生成一个随机的天数、小时数或分钟数(取决于分辨率)并将该数字添加到当前日期.

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

完整表达式为:

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

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

演示

相关文章