What is a primary key?

[kunal]

What is a primary key?

[Shivangi Panwar]

A primary key is a column whose values uniquely identify every row in a table. Primary key values can never be reused. If a row is deleted from the table, its primary key may not be assigned to any new rows in the future

[aramgregor]

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.

[pankaj86]

Primary key is a column in table that uniquely identify each row . Primary key is unique and not null

[Asif Ali]

Primary key use to Unique Record, if you have to include Primary Key with ID Column and you have insert record, you record is saved uniquely id.

[globalcscp]

hi,,
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.

[web developer]

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.

[Aamir Ali]

Primary Key is made unique your record than you can easily find correct record. If you delete any record with table row, then the same ID does not give another person.

[Subhanallah]

the primary key is use to make a relationships and unique records.

[smt]

Primary key is a relational database key that provide unique record and make relation between tables.............

[Hirva Fashion]

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.

[janpaul]

Primary key is one or more columns which is uniquely identifies each row in a table.

[Bilawal Bhatti]

primary key which is use to display unique record, and most beneficial for make a relationship with another table as well.

[SAP Tainer]

Primary key is column or combination of columns that are always unique and have no null value

[addisoncave]

Primary key is the unique value of a row in a database table, that used as a flag or a identity value for every row, it's unique value and most of time it's used for sorting.