On 24/12/2009 5:04 AM, Rosser Schwarz wrote:
On Wed, Dec 23, 2009 at 1:44 AM, Craig Ringer
<cr...@postnewspapers.com.au> wrote:
SELECT COALESCE( t_number::text, t:string::text, t_date::text, t_boolean::text)
AS value;
Your invocation of COALESCE is incorrect -- it is n-ary, but it
returns its first non-NULL argument.
Yes. That was the point.
I think we're assuming the OP wants different things. You're assuming
they're trying to concatenate all fields, where more than one field in a
given record may be non-null. I'm assuming that all but one field in
each record will be null, and they want to show the "value" of the
record - in other words, they're using the record as a sort of union
type. It looks like that from the example they gave.
--
Craig Ringer
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