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Find first or last record of each category using SQL Row Number function
Автор: Science in Data
Загружено: 2022-01-11
Просмотров: 531
Описание:
Find first or last record of each category using SQL Row Number function.
SQL Syntax:
SELECT Student_ID, Score FROM (
SELECT Student_ID, Attempt_no, Score,
ROW_NUMBER () OVER (PARTITION BY Student_ID ORDER BY Attempt_no DESC) as Row_Num
FROM SCIENCE_IN_DATA.Exam_Grade
) z
WHERE z.Row_Num = 1
Python/Pandas:
df.sort_values(by=['Student ID', 'Attempt_no'], ascending=[True, False]).groupby('Student ID').head(1)
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