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On 2011-08-31 18:14, ncreamer wrote:
The base_tutorial provides an query example where you first count a subset of
data (number of patients with ptsd) and divide that by the total number of
patients with any diagnosis.

Is there a way to - using this same patient example - query for the
percentages of the whole for *all* diagnosis?

SELECT COUNT (*) AS "Total PTSD Patients" FROM "Patients" WHERE
"Diagnosis"='PTSD';


The syntax is a bit different from what I'm used to, but I think you want "GROUP BY", as in:

SELECT COUNT (*) AS "Total PTSD Patients" FROM "Patients" GROUP BY
"Diagnosis";

/Ulrik


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