I keep reading that I should store this in a separate table "with one value per line". What does this mean exactly? Like this - So that each "favoriting" gets another user entry?

USER_ID SKU_Favorited

001 10016

001 10067

024 10016

001 10010

024 16779

Seems redundant to have to enter the same user twice, but is this what I should do? Then in lookup I just SELECT sku WHERE user id... and find all SKUs next to that number?

解決方案

It is called relational databases that are in 3-rd normal form

You have one table with users.

//users

id | username | password

And table with favorites

//favorites

id | userid | Favorited

here how you get it:

select * from favorites inner join users on favorites.userid=users.id where users.id=1

總結

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