我在SqlAlchemy中有两个表
class T1(Record, SqlBase):
__tablename__ = 'table1'
__table_args__ = (PrimaryKeyConstraint('column'), {'autoload': True},)
class T2(Record, SqlBase):
__tablename__ = 'table2'
__table_args__ = (PrimaryKeyConstraint('column'), {'autoload': True},)
我想在一些常见列上加入这两个表
session.query(T1).join(session.query(T2), T1.column == T2.column)
但是我收到了一个错误
InvalidRequestError: Could not find a FROM clause to join from. Tried joining to
... but got: Can't find any foreign key relationships
between 'T1' and 'FromGrouping object'. Perhaps you
meant to convert the right side to a subquery using alias()?
我该如何解决这个问题?两个表中都没有外键
最佳答案 有用
Doc
如果两个类都有关系,你可以使用join,或者你可以在没有连接的情况下编写查询
session.query(T1).filter(T1.column == T2.column)