Re: Unique and null

No. PostgreSQL.

I checked that post. And googled the answer. Postgres follows the SQL standard and permits multiple nulls in a unique column.

I should have done that instead of asking. I had first thought of it being a Django thing and couldn't find the answer in the docs.

Thanks for responding.

Cheers

Mike

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(Unsigned mail from my phone)

-------- Original message --------

From: Derek <gamesbook@gmail.com>

Date: 7/4/21 23:05 (GMT+10:00)

To: Django users <django-users@googlegroups.com>

Subject: Re: Unique and null

Are you using MySQL?

https://stackoverflow.com/questions/3712222/does-mysql-ignore-null-values-on-unique-constraints

On Wednesday, 7 April 2021 at 08:07:35 UTC+2 Mike Dewhirst wrote:

I have just made a CharField unique and Django detects duplicates nicely
but seems to ignore multiple instances where the field value is null.

    arn = models.CharField(
        max_length=MEDIUM,
        unique=True,
        null=True,
        blank=True,
    )

Is this correct behaviour?

Thanks

Mike



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