Other SQL Clauses
SQLAlchemy ORM also exposes support for other clauses in SQL, such as ORDER BY, GROUP BY, LIMIT, and OFFSET. All of these are supported by this connector:
ORDER BY
The following example sorts by a specified column using the session object's query() method:rs = session.query(Orders).order_by(Orders.WinProb) for instance in rs: print("Id: ", instance.Id) print("Id: ", instance.Id) print("Name: ", instance.Name) print("---------")
You can also use the session object's execute() method perform an ORDER BY. For example:
rs = session.execute(Orders_table.select().order_by(Orders_table.c.WinProb)) for instance in rs:
GROUP BY
The following example uses the session object's query() method to group records with a specified column:rs = session.query(func.count(Orders.Id).label("CustomCount"), Orders.Id).group_by(Orders.Id) for instance in rs: print("Count: ", instance.CustomCount) print("Id: ", instance.Id) print("---------")
You can also use the session object's execute() method to perform a GROUP BY:
rs = session.execute(Orders_table.select().with_only_columns([func.count(Orders_table.c.Id).label("CustomCount"), Orders_table.c.Id]).group_by(Orders_table.c.Id)) for instance in rs:
LIMIT and OFFSET
The following example uses the session object's query() method to skip the first 100 records and fetch the following 25:rs = session.query(Orders).limit(25).offset(100) for instance in rs: print("Id: ", instance.Id) print("Id: ", instance.Id) print("Name: ", instance.Name) print("---------")
You can also use the session object's execute() method to set a LIMIT or OFFSET:
rs = session.execute(Orders_table.select().limit(25).offset(100)) for instance in rs: