MySQL将其他表中的id值插入到匹配的行中

Question

我想规范化我的表格：

products
id | name | manufacturer | manufacturer_id

manufacturers
id | name

我需要查询来更新products.manufacturer_id，其中products.manufacturer = manufacturers.name（我将删除products.manufacturer）

非常感谢你的时间

汤姆

Answer 1

您可以尝试这样：

update products INNER JOIN manufacturers
set products.manufacturer_id = manufacturers.id
where products.manufacturer = manufacturers.name

Answer 2

update products p
   set p.manufacturer_id =
       (select m.id from manufacturers m where m.name = p.manufacturer)