SQLite根据其他表从表中选择

Question

我有2个表，一个是公司列表，另一个是产品列表。 产品链接到'company_id'列中的公司

为了更好地理解，这就是我想要做的事情：

SELECT * FROM Products WHERE company_id = (Company.id where name = Google)

撰写此声明的正确方法是什么？

Answer 1

将其写为子选择

SELECT * FROM Products WHERE company_id =(SELECT id FROM companies WHERE name = 'Google' limit 1)

或使用in（）运算符

进行子选择

SELECT * FROM Products WHERE company_id in (SELECT id FROM companies WHERE name = 'Google')

或将其写为联接

SELECT p.* 
FROM Products p
inner join companies c on p.company_id=c.id
WHERE c.name='Google'