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 below example sorts by a specified column using the session object's query() method.
rs = session.query(MARA).order_by(MARA.AnnualRevenue)
for instance in rs:
print("Id: ", instance.Id)
print("MANDT: ", instance.MANDT)
print("MATNR: ", instance.MATNR)
print("---------")
Alternatively, you can perform an ORDER BY using the session object's execute() method.
rs = session.execute(MARA_table.select().order_by(MARA_table.c.AnnualRevenue)) for instance in rs:
GROUP BY
The below example groups records with a specified column using the session object's query() method.
rs = session.query(func.count(MARA.Id).label("CustomCount"), MARA.MANDT).group_by(MARA.MANDT)
for instance in rs:
print("Count: ", instance.CustomCount)
print("MANDT: ", instance.MANDT)
print("---------")
Alternatively, you can perform a GROUP BY using the session object's execute() method.
rs = session.execute(MARA_table.select().with_only_columns([func.count(MARA_table.c.Id).label("CustomCount"), MARA_table.c.MANDT]).group_by(MARA_table.c.MANDT))
for instance in rs:
LIMIT and OFFSET
The below example skips the first 100 records and fetches the following 25 using the session object's query() method.
rs = session.query(MARA).limit(25).offset(100)
for instance in rs:
print("Id: ", instance.Id)
print("MANDT: ", instance.MANDT)
print("MATNR: ", instance.MATNR)
print("---------")
Alternatively, you can set a LIMIT or OFFSET using the session object's execute() method.
rs = session.execute(MARA_table.select().limit(25).offset(100)) for instance in rs: