關於「SQL UNIQUE KEY」標籤，搜尋引擎有相關的訊息討論：

Add unique constraint to combination of two columns - Stack Overflowstackoverflow.com › questions › add-unique-constraint-to-...Create unique constraints - SQL Server - Microsoft Learnlearn.microsoft.com › Learn › SQL › SQL ServerSQL UNIQUE Constraint - W3Schoolswww.w3schools.c