Forgive me if I missed it, but I can’t find the specific answer to this question.
Like the heading says, I have a column: standard BOOLEAN NOT NULL
I would like to enforce one row True, and all others False. The are no FK’s or anything else depending on this constraint. I know I can accomplish it with plpgsql, but this seems like a sledgehammer. I would prefer something like a CHECK or UNIQUE constraint. The simpler the better.
EDIT One row must be True, they cannot all be False.
Postgresql-9.5 if it matters
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