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.CheersMike--(Unsigned mail from my phone) -------- Original message --------From: Derek <gamesb...@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-constraintsOn 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 -- Signed email is an absolute defence against phishing. This email has been signed with my private key. If you import my public key you can automatically decrypt my signature and be sure it came from me. Just ask and I'll send it to you. Your email software can handle signing. -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/efd40f22-50d8-4250-9738-95d2152e68ecn%40googlegroups.com. -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/606e377e.1c69fb81.2c612.06e5SMTPIN_ADDED_MISSING%40gmr-mx.google.com.
