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MySQL Conditional Counter Based Other Columns?
I have a query that returns purchases for all customers in a store across a date range. It works fine, but now I've been asked to modify the results so only the first purchase per customer per day is...
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SELECT t.*, CASE WHEN CONCAT(t.CustomerName, CHAR(0), t.PurchaseDate) = @group THEN @num:=@num+1 ELSE @num:=1 END PurchaseNumberForDate,@group:=CONCAT(t.CustomerName, CHAR(0), t.PurchaseDate)...
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