我在表格中有两列，例如品牌和产品，那么如何防止同一品牌的产品插入？

Question

Suppose I have two column one is brand and other is product and there is a data like samsung and galaxy j8. If I insert again samsung and galaxy j8 it shows me error. So how to do this ?

Answer 1

From the database itself prevent duplicate insertion of two column use constrain like this

ALTER TABLE table_name
ADD CONSTRAINT constrain_name UNIQUE (brand,product);