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MySQL Query - How to Get Data From Current Month and Same Month Last Year?

dannyg280 asked
Last Modified: 2016-09-12
I have a simple query that sums sales totals for September and compares them with Sept of last year. How can I write this so that it auto updates with the current month month each month?

Select Salesman,
 SUM(CASE WHEN InvoiceDate Between '2015-9-1' and '2015-9-30' THEN Totsales else 0 end) as Sales15,
 SUM(CASE WHEN InvoiceDate Between '2016-9-1' and '2016-9-30' THEN Totsales else 0 end) as Sales16
 from vCustomerInvoiceDetail
Group by Salesman

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This is part of a PHP script so if there's a better/easier way to do it in PHP I'd be happy to hear about that as well.

Thank You!
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