根据列值加入类型

Question

我有两张桌子：

shops
id | shop_name | shop_type

products
id | shop_id | product_name

我需要LEFT JOIN products ON products.shop_id = shops.id IF shop_type is 0 我需要JOIN products ON products.shop_id = shops.id IF shop_type is 1。 什么是最快的解决方案？如果代码非常脏则无关紧要，性能是最重要的......

Answer 1

select *
from shops LEFT JOIN products ON products.shop_id = shops.id
where shop_type = 0 or (products.shop_id is not NULL and shop_type = 1)