關於「Sql server add unique constraint vs unique index」標籤，搜尋引擎有相關的訊息討論：

When should I use a unique constraint instead of a unique index?dba.stackexchange.com › questions › when-should-i-use-a...Difference between Unique Indexes and Unique Constraints in SQL ...www.sqlshack.com › difference-between-unique-indexes-a...Unique Constraints vs Unique Ind