mysql - 从存在外键表记录的表中选择 1 行

Question

我有两个表，Products 和 ProductImages，Products 和 ProductImages 之间存在一对多的关系。我正在尝试对 Products 表进行查询，条件是结果仅包含 ProductImages 表中具有匹配记录的行。

Products
----------
id (PK)

ProductImages
---------------
id (PK)
product_id (FK to Products)

我可以使用它的唯一方法是使用子查询，但肯定有更好/更有效的方法。

score 2 · Accepted Answer

2

SELECT p.* FROM Products AS p
INNER JOIN ProductImages AS pi ON p.id = pi.product_id
GROUP BY p.id

于 2012-06-28T06:34:11.893 回答

score 2 · Accepted Answer

用户join

SELECT * FROM Products INNER JOIN ProductImage  on 
Products.id  = ProductImage.product_id

score 0 · Accepted Answer

0

select * from products
where id in (select product_id from ProductImages)

于 2012-06-28T06:37:17.133 回答

score 0 · Accepted Answer

SELECT Products.* FROM Products
INNER JOIN ProductImages ON Products.id = ProductImages.id
and Products.Id = @ProductID // if required this condition

4 回答 4