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-- https://pgexercises.com/questions/date/endtimes.html
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-- https://pgexercises.com/questions/date/bookingspermonth.html
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select starttime, starttime + slots*('30 minutes'::INTERVAL) as endtime
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-- again, date_trunc works, date_part does not
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-- not surprisingly, as they solve different problems
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order by 2 desc, 1 desc
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limit 10
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select date_trunc('month',starttime) as month,
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count(starttime)
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from cd.bookings
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group by 1
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order by 1 asc