Question

Define The Term Primary Key

Answer 1

Answer:

A primary key is a special relational database table column (or combination of columns) designated to uniquely identify all table records.

A primary key is used as a unique identifier to quickly parse data within the database and find the relation between different tables. A relational database cannot have more than one primary key.

Answer 2

primary key is the mark or identification of the field. it is a unique field, so it can not be left blank . There is only one primary key in a table .

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