当使用sqlite3 for Python时，如何在SQL中创建主键和外键？

roejwanj 于 2022-12-23 发布在 SQLite

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我尝试创建两个表car_main和car_info。car_main有一个主键和一个外键，分别是car_id和model_id。car_info有两个外键，car_id和model_id。

connection = sqlite3.connect("TutorialDB.db")
crsr = connection.cursor()
sql_command = """CREATE TABLE car_main (
car_id INTEGER PRIMARY KEY,
model_id INTEGER FOREIGN KEY REFERENCES car_main(car_id),
);"""
crsr.execute(sql_command)
sql_command = """CREATE TABLE car_info (
car_id INTEGER FOREIGN KEY REFERENCES car_main(car_id),
model_id INTEGER FOREIGN KEY REFERENCES car_main(model_id),
year INTEGER,
price INTEGER,
used BOOLEAN
);"""
crsr.execute(sql_command)
connection.close()```

sqlite

来源：https://stackoverflow.com/questions/74882793/how-to-create-primary-and-foreign-keys-in-sql-when-using-sqlite3-for-python

1条答案

按热度按时间

r7knjye21#

外键语句没有意义，因为您引用的是同一个表

model_id INTEGER FOREIGN KEY REFERENCES car_main(car_id)

也许你需要

CREATE TABLE car_info (
    model_id INTEGER PRIMARY KEY,
    year INTEGER,
    price INTEGER,
    used BOOLEAN
);

CREATE TABLE car_main (
    car_id INTEGER PRIMARY KEY,
    model_id INTEGER,
    FOREIGN KEY(model_id) REFERENCES car_info(model_id)
);

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当使用sqlite3 for Python时，如何在SQL中创建主键和外键？

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