Question

write short note on primary key2​

Answer 1

Answer:

Note that empid is defined as the primary key for the table. In database terms, primary key refers to a column that has unique values for each row in a table. ... Therefore, if you create a table to hold employee data, the employee ID can be used as the primary key, as it is unique for all the rows of the employee table.

Answer 2

primary key is a field in a table which uniquely identifies each row/record in a database table. Primary keys must contain unique values. A primary key column cannot have NULL values.

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