> 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. ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend
