On 2009-06-06, Gianvito Pio <pio.gianvito@gmail.com> wrote:
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> Oh that was just an example...Let me make a real example:
> I have a table "Sensors" (that has to contain different sensor types) with
> a Value. That value doesn't have to be fixed, but I want to define it in a
> way that it changes its structure when the sensor type changes. For
> example, for Temperature sensor I would like to have just a float number,
> but for the humidity I could need of absolute and relative humidity
> (2 floats). I'd just like to know if I can say that the VALUE is a composite
> type...that I have then to specialize in Temp Type and Humidity type...using
> them in their particular case.
this appears to be EAV in disguise.