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Questions tagged [groupby]

A groupby operation: splits the data, applies a function to each group, and combines the results.

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Pushing down Group By clause [closed]

I've studied this exercise in class But I cannot figure out why, when I push down the Group By clause, I can remove RLCode attribute from GroupBy. Does this action change the meaning of query tree?
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Problem with sort by and group by in pandas

I have a DataFrame with duplicate id's but have different dates. For Example: ...