从表中选择所有早于3天的条目

Question

I've this table in my database:

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| id | name | model | inserted_time (timestamp) |
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When I insert something into my table the inserted_time get's set automatically so this is the current timestamp.

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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 */' );

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

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

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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 1

You can use now() or current_timestamp :

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