用sql中另一个表中的产品ID替换产品代码

Question

the previous developer has done a wrong practice in a sql database with phpmyadmin, which is creating a problem of duplicate contents.

Correct way:

table 1
ORDERS
id_order
id_product

table 2
PRODUCTS
id_product
internal_product_code

———

Wrong way:

table 1
ORDERS
id_order
internal_product_code

table 2
PRODUCTS
id_product
internal_product_code

Unfortunately, the internal_product_code is NOT always unique**, while id_product and id_order are always unique. So today my client has get the first duplicate data content, because there's two products with different id_product but same internal_product_code.

** the same internal_product_code due to a very similar specs (this is another bad practice)**

Is there any way to replace table1.internal_product_code with table2.id_product in order to follow the correct way? I need to do it in the database (after a strong backup).

Thanks to all

Answer 1

UPDATE orders SET products = (SELECT orders.id_order FROM products WHERE orders.id_product = products.internal_product_code LIMIT 1)