Oracle Query Always return records

Question

I want to have an Query In Which i always want to return one records regardless of exitence.
If no records exist ...it should appear as
NAME ID
0 0
if records exit it should appear as
NAME ID
manish 1

Answer 1

Hi,
You can do that with a UNION of your real query and something that selects the default values from dual. Just be sure the second part returns 0 rows when the real query returns anything.
WITH     real_query     AS
     SELECT     name
     ,     id
     FROM     table_x
     WHERE     ...
SELECT     *
FROM     real_query
UNION ALL
SELECT     '0'     AS name
,     0     AS id
FROM     dual
WHERE     NOT EXISTS (
                 SELECT  1
             FROM        real_query
;As always, be careful that the two prongs of the UNION have the same number and types of columns in the SELECT clause.