explain primary key and database
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A primary key is a column or a set of columns in a table whose values uniquely identify a row in the table. A relational database is designed to enforce the uniqueness of primary keys by allowing only one row with a given primary key value in a table.
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Primary key is a column or a set of columns in a table whose values uniquely identify a row in the table.
A relational database is designed to enforce the uniqueness of primary keys by allowing only one row with a given primary key value in a table.
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