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I would lIke to have Mysql group by days interval for example group by every 20 days from current day, like 1 - 20, 21 - 40, 41 - 60 and son on up to lets 120 days. The user can choose the days interval and up to how many days

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And your question is? What do you have already? – dezso Feb 27 '13 at 16:29
select floor(days / 20) as daygroup, count(*)
from mytable
group by daygroup
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