Data explorer query to return certain post notices?

Is there a way to extend this feature a little and send a notification to a user (or group) if a First time or Returning notice has been posted?

We’ve got someone who wishes to be in the role of ‘welcoming committee’ but who doesn’t read every post on a large forum. It would be great to have it as a notification for them.


Answering my own question, here is a Data Explorer query to pull those users who have most recently done their first post:

-- [params]
-- date :start_date

SELECT AS user_id, AS post_id, p.created_at
FROM users u
JOIN user_stats us
ON = us.user_id
JOIN posts p
ON = p.user_id
WHERE p.created_at = us.first_post_created_at
AND us.first_post_created_at BETWEEN :start_date::date AND NOW()
ORDER BY us.first_post_created_at desc

This is a minor modification of this query by @tshenry:

It could be improved by having a set time which it looks back from, e.g. one week or one month - but this defeated me as I couldn’t work out how to get NOW() - 7 or the like to work.

Also, excluding PMs as per another of @tshenry’s queries would be awesome but as I’m a SQL newbie it would take me ages to work out how to do it.


I think you would want something like:

AND us.first_post_created_at > NOW() - INTERVAL '7 DAYS'

(postgresql date/time docs)

To exclude PMs, you need to join to the topics table (following the posts.topic_id foreign key) and check the archetype column. Add this before the WHERE clause:

JOIN topics t ON p.topic_id =

…and this before the ORDER BY:

AND t.archetype = 'regular'

The post notices are actually stored in the post_custom_fields table, so you can get a more precise list of posts like this:

-- [params]
-- int :days_ago = 7

SELECT p.created_at, AS post_id,
       pcf.value AS "notice type"
FROM post_custom_fields pcf
INNER JOIN posts p ON pcf.post_id =
INNER JOIN topics t ON p.topic_id =
WHERE = 'notice_type'
  AND p.created_at > NOW() - INTERVAL ':days_ago days'
  AND t.archetype = 'regular'
ORDER BY p.created_at ASC

Absolutely brilliant! Thank you, that is so much better.


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