Re: Modify Primary Key

Assuming that you have n columns in the PK and the first n-1 columns are enough for PK.

1. Why not leave this as it is?
2. If you do not want to change everything at once you can create a unique index on the first n-1 columns and start to move the constraints to this index. When all is done just drop the PK constraint and you are done. All the fields should be already not null and the unique index on top of this gives you a PK.

Adar Yechiel
Rechovot, Israel

manoj.gurnani_at_polaris.co.in wrote:

>
>
>
>Hi,
> What are different steps to be followed in modifying a primary
>key(PK1) to exclude last primary key column from a list of primary key
>columns.
>assuming referential integrity constraints exists on primary key in diff
>tables.
>give necesary sql syntax to perform the tasks .
>
>Thanks
>Manoj
>
>
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