關於「MySQL UNIQUE key multiple columns」標籤，搜尋引擎有相關的訊息討論：

How do I specify unique constraint for multiple columns in MySQL?stackoverflow.com › questions › how-do-i-specify-unique-...MySQL Multiple Column Unique Key - Stack Overflowstackoverflow.com › questions › mysql-multiple-column-u...mysql UNIQUE KEY multiple columns with one colu