What is a primary key in a table?

1.	What is a primary key in a table?
Answer» Primary key is unique for each record Unique value which has no duplicate value. Primary key is the name or CAPTION given to a column in a table which has a unique value entered into it. Like in an employee table we have employee name and employee no. as columns. Here we have a primary key i.e. the employee no since it was always different for every employee and on the other side we have employee name as usual column since two employees can have same name.

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