Re: dynamic crosstab

> given that answers for a questionnaire are stored as a
> batch

Not in our setup - for all sorts of reasons (preserving responses on a connection failure or restart, monitoring response latency in real time, creating adaptive/branching questionnaires) we send each response separately.

> people running reports on will be the ones to notice, i.e. at
> retrieval time.

I am not sure - different responses are aggregated into different attributes in different ways - those properties need to be retrieved during scoring/report generation, so being able to create a join directly on a response is a good thing for me. But report generation - in our case it must be a DTP quality PDF - is such a beast anyway that db times dwarf compared to pdf generation.

The problem comes when I need to present the responses themselves in a human-friendly way - as an export or display or report. Do you think there is a way to ensure that the order of the values in the array below is the same for each person?

tbl(eID, aID, value)

Select eID, array_accum(value) from
(
(Select Distinct eID from tbl) e
CROSS JOIN
(Select Distinct aID from tbl) a
) ea
LEFT OUTER JOIN
tbl USING (eID, aID)
GROUP BY eID

Thx for the help.
B.