Differentiate between primary and secondary keyDifference between foreign key and Unique keyDifference between primary key and candidate keyDifference between primary key and unique keyDifference between primary key and foreign key in SAP ABAPSimilarity between primary key and unique keyPrimary key vs unique keyUnique key vs primary key關於「Difference between primary key and unique key」標籤，搜尋引擎有相關的訊息討論：
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