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  1. #1

  2. Default

    A 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

  3. #3

    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.

  4. #4

    Default

    Primary key is a column in table that uniquely identify each row . Primary key is unique and not null

  5. #5

    Default

    Primary key use to Unique Record, if you have to include Primary Key with ID Column and you have insert record, you record is saved uniquely id.

  6. #6

    Default

    hi,,
    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.
    Last edited by globalcscp; 04-20-2016 at 02:06 AM.

  7. #7

    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.

  8. #8

    Default

    Primary Key is made unique your record than you can easily find correct record. If you delete any record with table row, then the same ID does not give another person.

  9. #9

    Default

    the primary key is use to make a relationships and unique records.

  10. #10

    Default

    Primary key is a relational database key that provide unique record and make relation between tables.............

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