On 3/29/12 4:26 PM, Chris Angelico wrote:
On Fri, Mar 30, 2012 at 9:16 AM, David Salisbury<salisbury@xxxxxxxxx> wrote:
development=# select coalesce(anum,100) from t1 where anum = 4;
What you have there is rather different from COALESCE, as you're
looking for a case where the row completely doesn't exist. But you can
fudge it with an outer join.
Untested code:
WITH rowid AS (select 4 as anum) SELECT coalesce(anum,100) FROM rowid
LEFT JOIN t1 ON rowid.anum=t1.anum
However, you may simply want a WHERE [NOT] EXISTS predicate. There may
be other ways of achieving your goal, too.
Thanks guys! In fact I did see the difference between no row and a null
value within a row. But it seemed there must be a way that I was missing.
It does look though that plpg is the way to go, otherwise it just seems
to obfuscate the code, or have other possible consequences.
-ds
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