php - How to store an array in a database whilst sticking to normalization?

Question

I'm creating a website where people can share and upload things, but I want to add a like/recommend button. I want to check that if the user has recommended something or not, so they can't spam click it. I had an idea of how to do it: I had a column called 'recby' for each post and I would store a list of users who had recommended that post separated by commas. Then I learned about normalisation.

How would I do this whilst sticking to normalisation?

Answer 1

您添加一个为您存储喜欢的表格：

PostID | UserID
---------------
5      | 6
5      | 15
6      | 8

像这样的东西。现在，每个赞都有一个条目，同时保持一切正常化。