Firstly, let us get the current datetime with the help of the now() function.
mysql> select now();
The following is the output.
+---------------------+ | now() | +---------------------+ | 2018-11-01 19:55:56 | +---------------------+ 1 row in set (0.00 sec)
Syntax to subtract 10 days with the help of DATE_SUB()
select DATE_SUB(now(),interval integer_value day );
Applying the above syntax to subtract 10 days from the current datetime.
mysql> select DATE_SUB(now(),interval 10 day);
Here is the output.
+---------------------------------+ | DATE_SUB(now(),interval 10 day) | +---------------------------------+ | 2018-10-22 19:56:07 | +---------------------------------+ 1 row in set (0.00 sec)