php - Getting average number of uploads (or something else) per day -

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sorry if i'm using wrong se network question.

i'm in need of fetching average number of uploads , registrations website per day. problem can't seem figure out math task. in database tables uploads , registrations, have columns indicate when row created, stores unix timestamp.

how calculate average number of rows created per day?

select avg(anz) (     select     date(from_unixtime(your_ts_column)) my_date,     count(*) anz         your_table     group my_date ) subquery_alias

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