Knowing the number of watchers

Tom,

No, you can get that info at a topic level by swapping ‘topic’ for ‘category’ like this:

SELECT 
  COUNT(topic_id)
FROM 
  topic_users 
WHERE 
  notification_level = 3

Again, this is a very basic query that just returns a total count of watchers from…in this case…all topics. If you want to specify a particular topic, you could add to the WHERE clause, e.g:

WHERE 
  notification_level = 3
  AND topic_id = 29
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