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Asked: 2026-05-20T15:44:11+00:00

This is in reference to the still-open question here – I want to try

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This is in reference to the still-open question here – I want to try to approach it differently.

I have a MySQL table with two pieces of information: order_date and email_address. This is exhaustive and non-distinct, meaning that there are duplicates if someone happened to make more than one purchase per-day.

I need to get the following report in as few queries as possible, hopefully one:

YYYY-MM | number_emails_this_month | numer_emails_repeated_prior

Where some sample output from the query result would look like this:

YYYY-MM | number_emails_this_month | numer_emails_repeated_prior
2010-02     23423               1231
2010-03     4422                2234
2010-04     1424                650

Any help is greatly appreciated!

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1 Answer

  1. Editorial Team

    This question was answered in a subsequent related question here:

    MySQL Subquery with User-Defined Variables

    Ultimately the solution was to create a table with the ranges as-requested and join on that instead of using a subquery to define the ranges in question. In retrospect, use of the user-defined vars in MySQL aided the search for the subquery-less solution.

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