Question

我还没有足够的SQL查询构建经验。我有一张2桌：

producers ( 
    prod_id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, 
    prod_title text
); 

models ( 
    prod_id NOT NULL, 
    model_name text, 
    FOREIGN KEY (prod_id) REFERENCES producers(prod_id)
);

如何获取表格表格：

column1.............column2 

producer1...........the amount of models producers1

producer2...........the amount of models producers2

...

producerN...........the amount of models producerN

Answer 1

根据您对表的描述，您似乎想要使用count函数，并按生产者ID分组，请尝试以下操作：

select p.prod_title, count(*) 
from producers p
join models m on p.prod_id = m.prod_id
group by p.prod_id

SQL，打印每个模型的金额

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