關於「SQL unique index」標籤，搜尋引擎有相關的訊息討論：

What is the Point of using a Unique index on a Guid Columnstackoverflow.com › questions › what-is-the-point-of-usin...what does 'Create Unique Index' do? - DBA Stack Exchangedba.stackexchange.com › questions › what-does-create-uni...When should I use a unique constraint instead