Excerpts from Caleb.Welton's message of vie nov 19 15:48:06 -0300 2010:
> Note the standard also supports unnesting multiple arrays concurrently, the rule for handling arrays with different
lengthsis to use null padding of the shorter array.
>
> SELECT * FROM
> UNNEST( ARRAY[5,2,3,4],
> ARRAY['hello', 'world'] )
> WITH ORDINALITY AS t(a,b,i);
>
> a b i
> --- ---------- ------
> 5 'hello' 1
> 2 'world' 2
> 3 3
> 4 4
> (4 rows)
Hmm, this is pretty interesting and useful --- I had to deal with some
XPath code not long ago and I had to turn to plpgsql; I think it could
have been done with multi-array unnest.
--
Álvaro Herrera <alvherre@commandprompt.com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
