SQLAlchemy has two general classes of SQL construct - the FromClause and the
ColumnElement. A FromClause is a thing that goes in the FROM list of a SELECT
statement, whereas a ColumnElement goes into the columns clause, WHERE, ORDER
BY, GROUP BY, and ON sections of a SELECT statement.A
Yes,I know, so simple... but it didn't work for me as far I didn't set the
label for the internal select.
I try it many times, but always without it; I didn't know it was mandatory.
Thank you.
first_id_row = s.query(Row.id_row).\
filter(Row.id_head ==
from sqlalchemy import Column, Integer
from sqlalchemy.orm import Session
from sqlalchemy.ext.declarative import declarative_base
Base = declarative_base()
class Head(Base):
__tablename__ = head
id_head = Column(Integer, primary_key=True)
class Row(Base):
__tablename__ = row
I have a very simple case: two mapped classes, Head and Row, linked with
the id_head id column. This is the primary key for the Head, while
id_row is the primary key for the Row table.
I'm not able to create the following subqueries:
select
HEAD.id_head,
(select ROW.column_bla_bla from
