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mysql query to show non-payments for specific month(s)

kailee asked
Last Modified: 2015-06-15
I have a students table and a payments table.
they can be joined by sid.
I need to see sids that have no entry for april.  I tried this query, but it shows two students that have an entry for april.

SELECT students.sid, students.name, students.last_name FROM students LEFT JOIN payments ON students.sid = payments.sid WHERE students.Active = 'Yes' AND payments.forMonth != "Apr" GROUP BY payments.forMonth

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oddly, other students have also paid for april, but they don't show up in the list.

any help would be greatly appreciated.
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