group-by - List Questions

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Python - Take the last occurrence of a string value based on the latest date?

The groupby last function should work in this use case, as long as you can confirm that your data is being entered chronologically you can just do import pandas df = pandas.DataFrame(columns=['item',...

Tags: python, dataframe, group-by

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Sql - How to GROUP BY based on newly created MAX() column?

Here is how you can use your query as a subquery and perform the grouping SELECT Name,ID,MaxStatus FROM ( SELECT Name,ID,Status,MAX(Status) OVER(PARTITION BY Name) AS MaxStatus FROM [dbo].[TaskStat...

Tags: sql, group-by, partition

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Python - Group dataframe and sample n rows with equal probability between groups?

If you want to sample N rows with about the same probability to sample each group, you could oversample per group then sample again: import math N = 4 out = (df.groupby('ID').sample(n=math.ceil(N/df...

Tags: python, pandas, group-by

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