> Among my questions are:
>
> 1) Does the standard require that check constraints be
> valid at all times or only when rows of the constrained
> table are altered? Probably the former...
>
> 2) Does it make sense to get V2, V1.5.3, and Vulcan out
> and then have a serious talk about how constraints - row,
> verb, and deferred - should be implemented?

IMO, yes.

With regards,

Martijn Tonies
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