如何显示结果中的数据来自哪个表

CREATE TABLE orders (
    order_id INT PRIMARY KEY,
    customer_id INT,
    order_date DATE,
    source_table VARCHAR(50) -- 存储数据来源的表名
);

INSERT INTO orders (order_id, customer_id, order_date, source_table)
VALUES (1, 101, '2023-04-01', 'customers');

from sqlalchemy import create_engine, Column, Integer, String, Date
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

Base = declarative_base()

class Order(Base):
    __tablename__ = 'orders'
    order_id = Column(Integer, primary_key=True)
    customer_id = Column(Integer)
    order_date = Column(Date)
    source_table = Column(String)

engine = create_engine('sqlite:///example.db')
Base.metadata.create_all(engine)
Session = sessionmaker(bind=engine)
session = Session()

new_order = Order(
    order_id=1,
    customer_id=101,
    order_date='2023-04-01',
    source_table='customers'
)
session.add(new_order)
session.commit()

SELECT order_id, customer_id, order_date, source_table
FROM orders;