说你在艺术家和粉丝之间有许多表.在设计桌面时,您是否设计桌面：
ArtistFans
ArtistFanID (PK)
ArtistID (FK)
UserID (FK)
(ArtistID and UserID will then be contrained with a Unique Constraint
to prevent duplicate data)
或者您是否为两个相关字段构建复合PK：
ArtistFans
ArtistID (PK)
UserID (PK)
(The need for the separate unique constraint is removed because of the
compound PK)
使用以前的架构有什么优势(可能是索引？)？
