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Q: What is Primary Key in DBMS?

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Explanation :

A primary key is a special relational database table column or combination of columns designated to uniquely identify all table records. That is, A primary key is a column or set of columns in a table that uniquely identifies tuples (rows) in that table. A primary key, also called a Primary Keyword. Main Features Primary key are :: It must contain a unique value for each row of data. It cannot contain null values.

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