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  1. #31
    Senior Member
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    Sep 2016
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    Kolkata
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    299

    Re: What is a FOREIGN KEY ?

    A foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table or the same table.

  2. #32
    Senior Member
    Join Date
    Jul 2016
    Location
    Haslet TX
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    272

    Re: What is a FOREIGN KEY ?

    In the context of relational databases, a foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table or the same table. In simpler words, the foreign key is defined in a second table, but it refers to the primary key in the first table.

  3. #33
    Senior Member
    Join Date
    Jan 2016
    Posts
    203

    Re: What is a FOREIGN KEY ?

    A foreign key is a column or group of columns in a relational data source desk that provides a web link between data in two platforms.

  4. #34
    Senior Member
    Join Date
    Sep 2015
    Location
    jalandhar
    Posts
    166

    Re: What is a FOREIGN KEY ?

    Foreign keys are defined as the column or combination of column in which data of two column are related to each other.

  5. #35
    Junior Member
    Join Date
    Jun 2017
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    brasil
    Posts
    27

    Re: What is a FOREIGN KEY ?

    the foreign key is defined in a second table, but it refers to the primary key or a unique key in the first table.
    For example, a table called Employee has a primary key called employee_id. Another table called Employee Details has a foreign key which references employee_id in order to uniquely identify the relationship between both tables.

 

 
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