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Keywords, primary keywords, and candidate keywords in a relational database

Source: Internet
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Keywords: if a field or multiple field values can uniquely identify a record, the field or field group is called a keyword.


PRIMARY KEY : If a keyword is used to identify uniqueness for each record and is associated with other table implementations, it is referred to as the primary key (primary key, primary key), or master code.


candidate Keywords : keywords other than primary keywords are called candidate keywords.

Keywords, primary keywords, and candidate keywords in a relational database

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