Groupby Date and Categorical Column on Tables
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Suppose that I have 5 columns in my table as Stock, Date, Open, High, Low, Close. Stock is a string column and Date is in Date format. Suppose that same stock can repeat on same day.
How can I count of unique stocks on each Day? That would be table with number of unique stock counts against each date.
Given that each stock can have mutiple observation on same day how can I group by both Date and Stock to get average Open price for each stock on each day.