From: <juerg.rietmann@pup.ch>
> Hello there
Hello again Juerg - I take it you got that monster query working after?
> Is it possible (and I think it is) to do the following :
>
> I have a table with diameters and types. I need to build a comma separated
> string.
>
> typ diam
> 01 800
> 01 840
> 01 870
> 01 1120
>
> select diam from zylinder where typ='01'
>
> should produce the string "800,840,870,1120"
You'll want to build yourself a custom aggregate function. Check the mail
archives for someone else who did this recently (in the last month or so,
Tom Lane was involved in the discussion too). I forget the fella's name, but
he should have almost exactly what you want.
You can then do something like:
select typ, commify(diam) from zylinder group by typ;
- Richard Huxton
