Hi,
I need to store data that has a valid timespan with start and enddate.
objects ( id, name, ... )
object_data ( object_id referencs objects(id), startdate, enddate, ... )
nothing special, yet
How can I have PG reject a data record where the new start- or enddate
lies between the start- or enddate of another record regarding the same
object_id?
Also it isn't allowed that such timespans lie within another.
There can be times where no valid data exists but there can't be more
than one valid data-record for the same point in time.
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