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?

mysql relational-database
Edit
Report