Re: Column 'CHECK' Constraint: bug or ? - Mailing list pgsql-general

From Tom Lane
Subject Re: Column 'CHECK' Constraint: bug or ?
Date
Msg-id 1362.1000958551@sss.pgh.pa.us
Whole thread Raw
In response to Column 'CHECK' Constraint: bug or ?  (Keary Suska <hierophant@pcisys.net>)
Responses Re: Column 'CHECK' Constraint: bug or ?
List pgsql-general
Keary Suska <hierophant@pcisys.net> writes:
> It appears that Postgres checks column CHECK constraints when performing an
> update regardless of whether the particular column is being updated.

I believe that's true...

> Perhaps my understanding of column vs table constraints is incomplete
> but this doesn't seem to be proper behavior,

Why not?  A constraint is a constraint, it should be valid whenever one
checks it.

            regards, tom lane

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