Group by & count function in sqlalchemy

Question

I need the "group by and count" command in sqlalchemy. How can i do this?

Answer 1

The documentation during the count says that for group_by queries group_by better to use func.count() :

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

Answer 2

You can also count on several groups and their intersection:

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

In the above query, the counts will be returned for all possible combinations of values ​​from both columns.

Answer 3

If you use the Table.query property:

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

If you use the session.query() method (as indicated in the miniwark answer):

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