what is actually a primary key and how it is used ?
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A primary key is a special relational database table column (or combination of columns) designated to uniquely identify all table records. ... It must contain a unique value for each row of data. It cannot contain null values.
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A primary key is essential if a table is to qualify as a relational table. It is made up of one or more columns whose data uniquely identifies each row in the table. ... A primary key, therefore, is used to ensure the data in a specific column is unique.
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