Black Thursday is a system that is able to load, parse, search, and execute business intelligence queries against the data from a typical e-commerece business in Ruby.
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Business Intelligence - merchants that only sell one item by the month they registered #59
And merchants that only sell one item by the month they registered (merchant.created_at):
sa.merchants_with_only_one_item_registered_in_month("Month name") #=> [merchant, merchant, merchant]
https://github.com/turingschool/curriculum/blob/master/source/projects/black_thursday/iteration_4.markdown