Select all entries from a table which are older then 3 days

I’ve this table in my database:

-------------------------------------------------
| id | name | model | inserted_time (timestamp) |
-------------------------------------------------

When I insert something into my table the inserted_time get’s set automatically so this is the current timestamp.

---

Now I need to do a select on my table to get all entries wich are 3 days older then the inserted_time timestamp. I’m doing this in PHP with wpdb in WordPress. This is what I already have:

$results = $wpdb->get_results( 'SELECT * FROM  my_table WHERE inserted_time /*OLDER THEN 3 DAYS */' );

---

For example when I’ve following entry in my table:

-------------------------------------------------
| id | name | model | inserted_time (timestamp) |
-------------------------------------------------
| 1  | James |  xxx  |    2018-11-14 21:20:04   |
-------------------------------------------------

---

So when I do my select now and the current timestamp is 2018-11-15 11:20:04 I don’t want my entry in my results object / array (or what ever it is).

---

But when we have this current timestamp 2018-11-17 21:20:05 I need this in my results variable.

So I’m absolutely stumped with this. All my other stuff around this works fine but this is still a problem.

Is it possible to do this only with SQL? Or do I need to pass a parameter like $current_timestamp?

Answer

You can use now() or current_timestamp:

SELECT *
FROM  my_table
WHERE inserted_time < now() - interval 3 day;