Query MySQL table and fetch rows posted before the last 3 days?

Let’s say the current date is −

'2019-10-20

We will first see an example and create a table −

mysql> create table DemoTable1582
   -> (
   -> PostedDate datetime
   -> );
Query OK, 0 rows affected (13.36 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1582 values('2019-01-21 12:34:40');
Query OK, 1 row affected (1.06 sec)
mysql> insert into DemoTable1582 values('2019-10-15 11:00:00');
Query OK, 1 row affected (0.87 sec)
mysql> insert into DemoTable1582 values('2019-10-25 1:10:00');
Query OK, 1 row affected (1.14 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable1582;

This will produce the following output −

+---------------------+
| PostedDate          |
+---------------------+
| 2019-01-21 12:34:40 |
| 2019-10-15 11:00:00 |
| 2019-10-25 01:10:00 |
+---------------------+
3 rows in set (0.00 sec)

Here is the query to fetch rows posted before last 3 days.

mysql> select * from DemoTable1582
   -> where PostedDate between date_sub(PostedDate, interval 3 day) and now();

This will produce the following output −

+---------------------+
| PostedDate          |
+---------------------+
| 2019-01-21 12:34:40 |
| 2019-10-15 11:00:00 |
+---------------------+
2 rows in set (0.20 sec)