> Correct. It is annoying in some cases, but if the input to the trigger
> isn't of the column datatype, then what type is it? It's hard to see
> how that could work in general.
>=20
> If you want, say, a varchar length constraint to be checked only after
> the trigger runs, I'd counsel declaring the column as plain text and
> writing the length test as a CHECK constraint.
I had just an example, where it would have been convenient, if one could ch=
ange the type.
Let's say you want to give the users the possibility to enter incomplete da=
tes (year, year&month or the complete date). Indeed you could not insert th=
is information as it is. But later on for stats you would like to be able t=
o treat the column as a date.
I have implemented it by storing the user information in a varchar column a=
nd inserting the whole date in another column.
(if the user only provides the year, the date is inserted as 16.05.year,...=
).
Kind regards,
Daniel Struck
--=20
Retrovirology Laboratory Luxembourg
Centre Hospitalier de Luxembourg
4, rue E. Barbl=E9
L-1210 Luxembourg
phone: +352-44116105
fax: +352-44116113
web: http://www.retrovirology.lu
e-mail: struck.d@retrovirology.lu
