[Koha-bugs] [Bug 32154] Missing primary key on erm_user_roles table

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=32154

--- Comment #4 from Jonathan Druart <jonathan.druart+koha at gmail.com> ---
(In reply to Martin Renvoize from comment #3)
> Just thinking about this one, it feels to me like it should be a multi-field
> primary key rather than a new field entirely.
> 
> Having said that, it looks like we allow a user + licence + agreement
> combination to have multiple roles?  That would mean having all four fields
> in the primary key... food for thought.

It's actually not possible, license_id and agreement_id are nullable and thus
cannot be part of the primary key
https://mariadb.com/kb/en/primary-keys-with-nullable-columns/

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