Обсуждение: primary key and foreign key

Just want to be very clear that:

1. adding a primary key will have an implicit index automatically on the column(s).

2. Adding a foreign key will NOT have an index created automatically, it only does the referencing work. If an index is needed on the F-key column, it has to be created, right?

Thanks.

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--- Jessica Richard <rjessil@yahoo.com> wrote:

> Just want to be very clear that:
>
> 1. adding a primary key will have an implicit index automatically on the column(s).
>
> 2. Adding a foreign key will NOT have an index created automatically, it only does the
> referencing work. If an index is needed on the F-key column, it has to be created, right?

Correct.

Regards,
Richard Broersma Jr.