Re: Alter table column constraint

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От Melvin Davidson
Тема Re: Alter table column constraint
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Msg-id CANu8FizqULQssy4a0ewNWUEwxc6UhtQdDKX5sYFjNhCVwtfdyg@mail.gmail.com
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Ответ на Re: Alter table column constraint  ("Joshua D. Drake" <jd@commandprompt.com>)
Ответы Re: Alter table column constraint
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>I want to alter a term in a column's constraint to allow only specified
> strings as attributes
Yes, you must drop then add the revised constraint. However, from your statement above, it sounds to
me as if you would be better off using A FOREIGN kEY CONSTRAINT. It makes things a lot simpler.

On Mon, Dec 17, 2018 at 3:07 PM Joshua D. Drake <jd@commandprompt.com> wrote:
On 12/17/18 12:01 PM, Rich Shepard wrote:
> On Mon, 17 Dec 2018, Rich Shepard wrote:
>
>> I want to alter a term in a column's constraint to allow only specified
>> strings as attributes and have not found how to do this in the docs
>> (using
>> version 10 docs now). There is an alter table command that allows
>> renaming
>> a constraint but I've not seen how to modify the constraint itself.
>
>   Is the procedure to drop the current check constraint then add the
> revised
> one?

Or the other way around but yes.

JD


>
> Rich
>

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Melvin Davidson
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