關於「SQL multiple primary key」標籤，搜尋引擎有相關的訊息討論：

Can I have multiple primary keys in a single table? - Stack Overflowstackoverflow.com › questions › can-i-have-multiple-prim...Can Multiple Primary Keys Exist on a Single Table? - Chartiochartio.com › resources › tutorials › can-multiple-primary-...SQL PRIMARY KEY Constraint -