混合UPDATE SELECT查询

Question

我需要运行UPDATE查询：

UPDATE products
    SET fcategory = SELECT fcategory 
                    FROM categories 
                    WHERE categories.scategory = products.scategory

即。对于＆＃34;产品中的行＆＃34;其中列scategory = categories.scategory，products.fcategory必须更新为categories.fcategory

示例：

categories.scategory monkies, categories.category gorilla
products.scategory monkies

=＆GT; products.fcategory必须更新为gorilla，因为products.scategory = monkies = products.scategory

任何人都知道如何编写这样的UPDATE查询？

感谢。

Answer 1

使用JOIN

UPDATE products AS p
JOIN categories AS c ON p.scategory = c.scategory
SET p.fcategory = c.scategory