SQL多对多选择 [英] SQL many to many select
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问题描述
category_product
---------------
id_category
id_product
product
---------------
id_product
id_manufacturer
manufacturer
---------------
id_manufacturer
name
当id_category等于某个值时,我将如何创建一个SQL查询,以便从制造商中选择所有名称?
How would I create an SQL query so that it selects all the names from manufacturer when id_category is equal to something?
推荐答案
这是表的直接内部联接:
It's a straightforward inner join of the tables:
SELECT m.name, cp.id_category
FROM manufacturer as m
INNER JOIN product as p
ON m.id_manufacturer = p.id_manufacturer
INNER JOIN category_product as cp
ON p.id_product = cp.id_product
WHERE cp.id_category = 'some value'
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