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mysql query to show non-payments for specific month(s)
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.
oddly, other students have also paid for april, but they don't show up in the list.
any help would be greatly appreciated.
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
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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