How to select one row with such sql

Question

hi , everyone
I got a headache about this sql:
select * from E_VPN_pbxlink where ((SPILOTNUM ='1234' ) or (SPILOTNUM ='123')) order by SPILOTNUM desc ;
it retruns 2 records.
I need to get the record with SPILOTNUM ='1234' , how can I reform this sql
tks

Answer 1

Hi,
I think I see:
You want the longest spilotnum that starts with the same charachters as the parameter.
You can do a Top-N Query like this:
WITH  got_rnum     AS
     select  e.*
     ,     RANK () OVER (ORDER BY  LENGTH (spilotnum DESC)     AS rnum
     from      E_VPN_pbxlink
     where      '123456'     LIKE SPILOTNUM || '%'
SELECT     *     -- or list all columns except rnum
FROM     got_rnum
WHERE     rnum     = 1
;There is a slightly simplerr way, using the ROWNUM pseudo-column, but its only slightly easier, and it won't help if, say, you want to pass two or more targets such as '123456' in the same query.