Removed use of subqueries in email analytics queries #19917
Merged
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closes https://linear.app/tryghost/issue/ENG-790/remove-use-of-sub-queries-in-email-analytics
Avoiding sub queries means we don't have a process tied up for longer than necessary and we can more easily see if one of the queries is non-performant.
delivered_count
by switching fromIS NOT NULL
toIS NULL
to match the typical data stored in that column so it needs to read far fewer rows from the index when counting (see below for before/after)delivered_at IS NOT NULL
vsdelivered_at IS NULL