[DB-SIG] Date/Time question
Wed, 22 Mar 2000 14:25:05 +0100
implementing my Ingres module, I run across the following
implementation aspects: According to the DB API 2.0, there are methods
for building several time/date value combinations. But the DATETIME
object seems to represent absolute values only.
Is this correct? If so, has someone made a proposal for representing
time intervals. Since Ingres supports arithmetic on absolute and
relative time, it would be nice to have both.
Most database systems, that support temporal data, have a notation of
`now' and `today', why these values not make default parameters? As
far as I know some Systems internally represent date/time as strings
(Informix, Ingres). Since there's no string parameter to the date/time
methods, conversion takes place two times. Another side effect would
be, that `now' and `today' are evaluated at execution time, not at
Holger Meyer, Uni of Rostock, Dpt. of CS, DB Research Group