Hello Nils and Jerry,
Thanks you for your quick reply!
IMO, using trigger looks cleaner and prettier than Excel-like
so I will probably give triggers a try.
Searching on the net, I found some articles on check constraints in MySQL.
On 2/13/07, Nils Meyer <meyer@stripped> wrote:
> Hi Js,
> js wrote:
> > Is there any easy way to implement 'NOT EMPTY' constraint?
> There currently is no support for CHECK Constraints in MySQL, at least
> to my knowing. So you'd have to go with a trigger.
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