what is avoided by assigning primary key in a table
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A primary key is a unique combination of attributes that is used to preferentially access each record in a table. None of the attributes can be null. ... In practice about 20% of databases violate primary key rules. It would seem that developers should be using data modeling tools.
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A primary key is a unique combination of attributes that is used to preferentially access each record in a table. None of the attributes can be null. ... In practice about 20% of databases violate primary key rules. It would seem that developers should be using data modeling tools.
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