what is primary key?

what is primary key?

A primary key, also called a primary keyword, is a key in a relational database that is unique for each record. It is a unique identifier, such as a driver license number, telephone number (including area code), or vehicle identification number (VIN). A relational database must always have one and only one primary key.

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

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Originally Posted by Ashley234

A primary key, also called a primary keyword, is a key in a relational database that is unique for each record. It is a unique identifier, such as a driver license number, telephone number (including area code), or vehicle identification number (VIN). A relational database must always have one and only one primary key.

A primary key additionally called a primary keyword, is a key in a social database that is interesting for each record. It is a one of a kind identifier, for example, a driver permit number, phone number (counting range code), or vehicle recognizable proof number (VIN). A social database should dependably have one and just a single primary key

The PRIMARY KEY constraint uniquely identifies each record in a database table and therefore needs to contain a unique value

A primary key, also called a primary keyword, is a key in a relational database that is unique for each record. It is a unique identifier, such as a driver license number, telephone number (including area code), or vehicle identification number (VIN). A relational database must always have one and only one primary key.

Primary keys typically appear as columns in relational database tables.

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A primary key, also called a primary keyword, is a key in a relational database that is unique for each record. It is a unique identifier, such as a driver license number, telephone number (including area code), or vehicle identification number (VIN). A relational database must always have one and only one primary key.

A primary key is the key in relational database that is unique for each of the record. It is the special relational database column which is designated to uniquely identify all table records. The main feature of primary key is that it must contain unique value for each row of data.

A primary key is a special relational database table column (or combination of columns) designated to uniquely identify all table records.
A primary key’s main features are:
It must contain a unique value for each row of data.
It cannot contain null values.


A primary key is either an existing table column or a column that is specifically generated by the database according to a defined sequence.

A Primary key uniquely identifies every row in a database table.Every table can have only one PK defined on a particular column.A primary key column cannot have NULL values.

A primary key is a field in a table. It's individually identify each row or record in a database table. It must have unique values.

A primary key also called a primary keyword, is a key in a relational database that is unique for each record.

A primary key is a minimal set of attributes (columns) in a table that uniquely identifies tuples (rows) in that table.