#27627: OneToOneField doesn't allow multiple records with NULL value on 
Microsoft
SQL Server
-------------------------------------+-------------------------------------
     Reporter:  Ryan Schave          |                    Owner:  nobody
         Type:  Bug                  |                   Status:  closed
    Component:  Database layer       |                  Version:
  (models, ORM)                      |
     Severity:  Normal               |               Resolution:  invalid
     Keywords:                       |             Triage Stage:  Accepted
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
-------------------------------------+-------------------------------------
Changes (by Tim Graham):

 * cc: Michael Manfre (added)
 * status:  new => closed
 * resolution:   => invalid


Comment:

 It looks like removing `supports_nullable_unique_constraints = False` may
 already yield a regression test in `tests/one_to_one/tests.py` due to the
 usage of the feature flag there. Maybe other backends like `django-mssql`
 would want to fix the issue so we could remove that feature?

--
Ticket URL: <https://code.djangoproject.com/ticket/27627#comment:6>
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