On Friday, January 4, 2019, Rich Shepard <rshep...@appl-ecosys.com> wrote:
> On Fri, 4 Jan 2019, David G. Johnston wrote: > > The is null expression is redundant since check constraints pass when the >> result is unknown. >> > > David, > > I wondered about this since NULL can be missing, unknown, or otherwise > defined. Are there benefits to allowing an empty value in that column when > checking that it's later than the start date rather than explicitly setting > a default date after the start date? > > I don’t understand the question... David J.
