RE: Always return at least one value
- From: Stephen.Lee@xxxxxxxx
- To: oracle-l@xxxxxxxxxxxxx
- Date: Fri, 19 Mar 2004 11:41:48 -0600
Cool!
But now I think Oracle needs a WHEN_NO_ROWS or GIMME_SOMETHING function.
In case your are wondering: This has to run as a Cartesian product of four
subqueries (which are the subject of my question) to give every combination
of output with four input characters. For example: If input #1 is 'A', then
the output might be 'C','D','X'. If input #2 is 'C', the output might be
'Y','Z', etc. But if one of the input characters has no output equivalent,
then we still must find combinations of the remaining characters with a '-'
in place of the unmatched character.
> -----Original Message-----
> SQL> select decode(z.table_name, chr(255), 'Nix',
> z.table_name) table_name
> 2 from (select table_name,
> 3 rownum rn
> 4 from user_tables
> 5 where table_name like 'O%'
> 6 union all
> 7 select chr(255), 99999999999999999999
> 8 from dual) z
> 9 where decode(rownum, 1, z.rn, rownum) = z.rn
> 10 /
>
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