Answers for "count all records and group by column status"

count entries groupby

df.groupby(['col1']).size()

Posted by: Guest on September-09-2021

sql count matching group by

# To count the number of teachers in each department, including 
# rows where COUNT(t.name) == 0
SELECT d.name,COUNT(t.name) FROM teacher t
RIGHT JOIN dept d ON (t.dept=d.id) GROUP BY d.name;

Posted by: Guest on December-21-2021

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