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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. #53

    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. #55

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    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

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