Is it that a primary key is the selected candidate key chosen for a given table?
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Candidate Key– A Candidate Key can be any column or a combination of columns that can qualify as unique key in database. There can be multiple Candidate Keys in one table. Each Candidate Key can qualify as Primary Key.Primary Key– A Primary Key is a column or a combination of columns that uniquely identify a record. Only one Candidate Key can be Primary Key.More on this link with example