Group by & count function in sqlalchemy

Question

I want a “group by and count” command in sqlalchemy. How can I do this?

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Answer 1

The documentation on counting says that for group_by queries it is better to use func.count():

from sqlalchemy import func
session.query(Table.column, 
   func.count(Table.column)).group_by(Table.column).all()

Answered By: miniwark

Answer 2

You can also count on multiple groups and their intersection:

self.session.query(func.count(Table.column1),Table.column1, Table.column2).group_by(Table.column1, Table.column2).all()

The query above will return counts for all possible combinations of values from both columns.

Answered By: fccoelho

Answer 3

If you are using Table.query property:

from sqlalchemy import func
Table.query.with_entities(Table.column, func.count(Table.column)).group_by(Table.column).all()

If you are using session.query() method (as stated in miniwark’s answer):

from sqlalchemy import func
session.query(Table.column, func.count(Table.column)).group_by(Table.column).all()

Answered By: Jakub Kukul

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