Where to put the user foreign key in this many to many relationship?

Question

I have a many to many relationship with bookmarks and tags. Each tag can have many bookmarks, and each bookmark can have many tags.

Users

• Id
• Username

Tags

• Id
• UserId
• Title

Bookmarks

• Id
• UserId
• Title
• Link

TagsBookmarks (junction table)

• TagId
• BookmarkId

I have a reference to an UserId in Tags and Bookmarks table. Is this normalized? The reason I do this is because I sometimes need to load a list of tags that belong to a specific user without bookmarks, and vice versa.

Answer 1

Your structure is valid and normalized.