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what is primary key?

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  1. #1
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    Default what is primary key?

    what is primary key?

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    Senior Member Ashley234's Avatar
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    Default Re: 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.

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    Default Re: what is 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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    Default Re: what is primary key?

    Excellent description.

    Quote Originally Posted by Ashley234 View Post
    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.

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    Default Re: what is 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

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    Default Re: what is primary key?

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

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    Senior Member charlottegracie's Avatar
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    Default Re: 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.

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    Default Re: what is primary key?

    Primary keys typically appear as columns in relational database tables.

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    Default Re: what is primary key?

    Thanks For Your Information share it.

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    Default Re: 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.

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    Default Re: what is 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.

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    Default Re: what is primary key?

    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.

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    Default Re: what is primary key?

    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.

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    Default Re: what is primary key?

    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.

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    Default Re: 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.