What is a primary key?

[Ryan Tom]

An essential key, likewise called an essential catch phrase, 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 region code), or vehicle recognizable proof number (VIN). A social database should dependably have one and just a single essential key.

[Shivam Tripathi]

Primary key is thye unique column of the table.It is unique key.The main feature of the primary key the unique values of per row and it cant not contain null values.

[praveenitech]

A primary key is a column whose values uniquely identify every row in a table.

[Peter-Jolie]

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.

[Aachman]

The primary key is a unique key that uniquely defined the records.

[Peter-Jolie]

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.

[sankalppatil]

The primary key are used to unique information.it is usefull for relational database management system.

[damponting44]

Primary key also known as Primary keyword. Primary keys are the unique to related information in other where the key is used. Primary keys may consist of a single attributes or multiple attributes in combination.

[krupali patel]

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.

[hinabutt]

Primary key is the focus keyword in On-Page SEO. It keeps repeating.

[manasgabani]

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.

Android Training

[joktacademy]

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

[ravig]

Unique identifier which can be used to identify any particular row within table. Primary Key also named as PK could be a single column or combination of columns. in RDBMS, PK is generally indexed and sorted.

[LowPingVPS]

Simply its a Unique Index on a database table.

[mjonutz]

A primary key is a special relational database table column (or combination of columns) designated to uniquely identify all table records. I think this definition is pretty good.