85. Count Events Per Month
MediumDates & TimestrftimeGROUP BY month
To aggregate by calendar month you GROUP BY a month key built with strftime('%Y-%m', date), which collapses every date in the same month to one bucket like '2024-03'.
Task: return ym (the '%Y-%m' month key) and cnt (the number of events in that month). Include only months that actually have events. Order by ym.
Output columns, in order: ym, cnt.
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