Filter value with wildcards

Question

Hello there
I have a table called phone_shop_tab
ID MODEL CHANNEL
001 NOKIAn95 3g
002 % gsm
003 nokian97 %
004 nokian97 gsm
005 % %
006 % 3g
i have to select all from phone_shop_Tab if i pass
MODEL= <value> and CHANNEL = <value>
Here % is any values
I should get the output with the follwing constraints
% denots any value passed . for example % in the MODEL column means that it is OK for any MODEL value passed to the query.
if i fliter with MODEL= 'NOKIAn97' and CHANNEL = 'gsm' it should select 4th row because it exacly matches the filer
if i fliter with MODEL= 'NOKIAn97' and CHANNEL = 'XXX' it should select 3th row because it matches model (nokian97) also channel (%) here XXX= %
if i fliter with MODEL= 'BAC' and CHANNEL = '3g' it should select 6th row because it matches model (%) also channel (3g) ,here BAC = %
if i fliter with MODEL= 'ABC' and CHANNEL = 'XYZ' which are both not in the table it should select 5th row because it matches model (%) also channel (%) because % mean any value
hope you all understand the output scinario
can anyone provide with an SQL statment for this.
thanks
prash

Answer 1

Hi,
This does what you requested:
SELECT     *
FROM     phone_shop_tab
WHERE     UPPER (:p_model)     LIKE UPPER (model)
AND     UPPER (:p_channel)     LIKE UPPER (channel)
;You said, for example:
if i fliter with MODEL= 'NOKIAn97' and CHANNEL = 'gsm' it should select 4th row because it exacly matches the filerIf :p_model='NOKIAn97' and :p_channel='gsm', this will indeed returrn the row where id=004. It will also return the rows where id IN (002, 005).
If you meant that it should only return the best match (however you define "best"), then use the analytic RANK (or perhaps ROW_NUMBER) fucntion to arrange the rows found in "best first" order, then pick the ones labeled 1.
For example:
WITH     all_matches     AS
     SELECT     p.*
     ,     RANK () OVER ( ORDER BY  CASE WHEN model   = '%' THEN 2 ELSE 1 END
                      ,      CASE WHEN channel = '%' THEN 2 ELSE 1 END
                    ) AS rnum
     FROM     phone_shop_tab     p
     WHERE     UPPER (:p_model)     LIKE UPPER (model)
     AND     UPPER (:p_channel)     LIKE UPPER (channel)
SELECT     *     -- or list all columns except rnum
FROM     all_matches
WHERE     rnum     = 1
;