Cam sexy teen video web - Updating the primary key

updating the primary key-83

Some possible examples of unique keys are Social Security Numbers, ISBNs, vehicle registration numbers or user login names.

The relational model, as expressed through relational calculus and relational algebra, does not distinguish between primary keys and other kinds of keys.

Here is an example of a primary key becoming a foreign key on a related table.

ID migrates from the Author table to the Book table.

Keys that migrate to another entity may or may not be unique, depending on the design and how they are used in the other table.

Comments

  • Emo chat nude
    Reply

    For Punjabis who are looking to lose weight, you don’t have to resort to eating bland food which does nothing for your palate.

  • Free mature sex chat
    Reply

    If you live in an Apple-only universe with constant access to Wi-Fi (and so does everyone you want to talk to), look no further than Face Time.

  • datingwithoutkids info
    Reply

    Для согласия с вышеприведенной информацией, подтвердите свою дату рождения и нажмите кнопку ВОЙТИ.

  • sara khan and angad hasija dating
    Reply

    Sandy told me that her countrymen could still bully their women and that they were far from perfect, but at least they were honest, straightforward, and took marriage seriously.