| From: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
|---|---|
| To: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
| Cc: | Gregory Stark <stark(at)enterprisedb(dot)com>, David Fetter <david(at)fetter(dot)org>, Edward Stanley <Edward(dot)Stanley(at)mcs(dot)vuw(dot)ac(dot)nz>, Richard Huxton <dev(at)archonet(dot)com>, Sean Utt <sean(at)strateja(dot)com>, Andrew Hammond <andrew(dot)george(dot)hammond(at)gmail(dot)com>, josh(at)agliodbs(dot)com, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: My honours project - databases using dynamically attached entity-properties |
| Date: | 2007-03-14 15:32:30 |
| Message-ID: | 45F8158E.50402@dunslane.net |
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| Thread: | |
| Lists: | pgsql-hackers |
Joshua D. Drake wrote:
> Gregory Stark wrote:
>
>> "David Fetter" <david(at)fetter(dot)org> writes:
>>
>>
>>> CREATE TABLE symptom (
>>> symptom_id SERIAL PRIMARY KEY, /* See above. */
>>> ...
>>> );
>>>
>>> CREATE TABLE patient_presents_with (
>>> patient_id INTEGER NOT NULL REFERENCES patient(patient_id),
>>> symptom_id INTEGER NOT NULL REFERENCES symptom(symptom_id),
>>> UNIQUE(patient_id, symptom_id)
>>> );
>>>
>> I'm just glad I don't have your doctor. I hope mine doesn't think symptoms are
>> all boolean values.
>>
>
> With a unique across (patient_id,symptom_id) you could have a single
> patient with as many unique symptoms as could be listed.
>
>
>
>
I think Greg is suggesting that the table needs to be augmented with,
say, a severity field.
cheers
andrew
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