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> 7/ Does it support complex time comparisons? No examples, red flag.

Can Metabase do this? I struggled to get a This Year vs Last Year chart without messing with the underlying data.

Is there a good book on Metabase out there?

yes it is, as long as you can represent it in SQL.

for instance, for a query like:

select day_of_year, year, count(*) from orders where year >= 2016 group by day_of_year, year

you can create a line visualization that will display the different years as different lines in about 2 or 3 clicks.

AFAIK, there is no book for Metabase. But the documentation and the project is really straightforward.