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  1. #51

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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.

  2. #52

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

  3. Default

    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.
    Last edited by damponting44; 04-19-2018 at 05:56 AM.

  4. #54

    Default

    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.

  5. Default

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

  6. #56

    Default

    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

  7. #57

    Default

    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

  8. #58
    Join Date
    Aug 2018
    Location
    New Delhi, India
    Posts
    26

    Default

    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.

  9. Default

    Simply its a Unique Index on a database table.

  10. #60

    Default

    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.

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