Question

I have a transaction table that registers email reads using a tracking pixel in our email marketing messages. I’m trying to structure a query that will give me the records in the transaction table whose last recorded email read was more than 6 weeks ago. Reason being, those transactions haven’t “engaged” in our email marketing and I need to update one of their subscriber fields to reflect that (so they can receive a different type of email).

If I were to write it out in English, the statement would look kind of like this:

Select the row from transactions where the subscriber id IS present more than 6 weeks ago but IS NOT present in the last 6 weeks.

So, one initial thought is to create my recordset of those who have opened emails in the last 6 weeks, then compare that against the rest of the table? Can I do this in one statement or should I break it into two?

Thanks in advance for anybody who can help with this.

Answer 1

SELECT SubscriberId
    FROM TransactionTable
    GROUP BY SubscriberId
    HAVING MAX(ReadDate) < DATE_SUB(NOW(), INTERVAL 6 WEEK)