Problem in using PARTITION BY with SCORE

Question

Hi
I have a table in which I have list of products along with the name of the company that offers that product. Table structure is as shown below:
PRD_ID NUMBER
PRD_NAME VARCHAR2(100)
COMPANY_NAME VARCHAR2(100)
PRD_DESC VARCHAR2(500)
DUMMY CHAR(1)
I have created an Intermedia Index on PRD_NAME and PRD_DESC with
PRD_NAME and PRD_DESC as two separate field sections.
Now I want to retrieve up-to 3 products per company that match the searched keywords. Now if a user searches for Candle Holders then I write following query
SELECT A.*, ROWNUM FROM
(SELECT SCORE(1) AS SC,
PRD_ID,
     PRD_NAME,
     COMPANY_NAME,
     ROW_NUMBER() OVER (PARTITION BY COMPANY_NAME ORDER BY SCORE(1) DESC) AS RK
FROM PRODUCTS
WHERE CONTAINS(DUMMY,'(Candle Holders)*7, ($Candle $Holders)*5, (Candle% Holders%)*3) within PRD_NAME)'
,1) > 0 ) A
WHERE A.RK <= 3
ORDER BY A.COMPANY_NAME, SC DESC;
I have many records in my database that should get a score of 100 in the above query - e.g.
Glass Candle Holder Comp1
Iron Candle Holder Comp1
Metal Candle Holder Comp2
Votive Candle Holder Comp3
Silver Plated Candle Holder Comp4
Gold Plated Candle Holder Comp4
Copper Plated Candle Holder Comp4
Platinum Coated Candle Holder Comp4
and so on.
My query is returning upto 3 records per company, but it is not giving 100 as score.
If I remove the row_number() partition by clause, then my query returns 100 score.
I want to restrict the query from returning product at a certain cut-off score.
Please advise what is wrong in the above query and what can I do to fix the problem
Regards
Madhup

Answer 1

I am unable to reproduce the problem given only what you have provided. I get the same score no matter what. What version of Oracle are you using? The only thing I can think of is to put the query without the row_number in an inline view and add a condition where rownum > 0 to try to materialize the view, then apply your row_number in an outer query, as in the last query in the example below.
SCOTT@10gXE> CREATE TABLE products
  2    (PRD_ID           NUMBER,
  3       PRD_NAME      VARCHAR2(100),
  4       COMPANY_NAME  VARCHAR2(100),
  5       PRD_DESC      VARCHAR2(500),
  6       DUMMY           CHAR(1)
  7  )
  8  /
Table created.
SCOTT@10gXE> INSERT ALL
  2  INTO PRODUCTS VALUES (1, 'Glass Candle Holder', 'Comp1', NULL, NULL)
  3  INTO PRODUCTS VALUES (2, 'Iron Candle Holder', 'Comp1', NULL, NULL)
  4  INTO PRODUCTS VALUES (3, 'Metal Candle Holder', 'Comp2', NULL, NULL)
  5  INTO PRODUCTS VALUES (4, 'Votive Candle Holder', 'Comp3', NULL, NULL)
  6  INTO PRODUCTS VALUES (5, 'Silver Plated Candle Holder', 'Comp4', NULL, NULL)
  7  INTO PRODUCTS VALUES (6, 'Gold Plated Candle Holder', 'Comp4', NULL, NULL)
  8  INTO PRODUCTS VALUES (7, 'Copper Plated Candle Holder', 'Comp4', NULL, NULL)
  9  INTO PRODUCTS VALUES (8, 'Platinum Coated Candle Holder', 'Comp4', NULL, NULL)
10  SELECT * FROM DUAL
11  /
8 rows created.
SCOTT@10gXE> BEGIN
  2    FOR i IN 1 .. 10 LOOP
  3        INSERT INTO products (prd_id, prd_name, company_name)
  4        SELECT object_id, object_name, 'Comp1' FROM all_objects;
  5    END LOOP;
  6  END;
  7  /
PL/SQL procedure successfully completed.
SCOTT@10gXE> COMMIT
  2  /
Commit complete.
SCOTT@10gXE> EXEC CTX_DDL.CREATE_PREFERENCE ('your_multi', 'MULTI_COLUMN_DATASTORE')
PL/SQL procedure successfully completed.
SCOTT@10gXE> BEGIN
  2    CTX_DDL.SET_ATTRIBUTE ('your_multi', 'COLUMNS', 'PRD_DESC, PRD_NAME');
  3  END;
  4  /
PL/SQL procedure successfully completed.
SCOTT@10gXE> EXEC CTX_DDL.CREATE_SECTION_GROUP ('your_sec_group', 'BASIC_SECTION_GROUP')
PL/SQL procedure successfully completed.
SCOTT@10gXE> BEGIN
  2    CTX_DDL.ADD_FIELD_SECTION ('your_sec_group', 'PRD_DESC', 'PRD_DESC', TRUE);
  3    CTX_DDL.ADD_FIELD_SECTION ('your_sec_group', 'PRD_NAME', 'PRD_NAME', TRUE);
  4  END;
  5  /
PL/SQL procedure successfully completed.
SCOTT@10gXE> CREATE INDEX your_index ON products (dummy)
  2  INDEXTYPE IS CTXSYS.CONTEXT
  3  PARAMETERS
  4    ('DATASTORE     your_multi
  5        SECTION GROUP your_sec_group')
  6  /
Index created.
SCOTT@10gXE> EXEC DBMS_STATS.GATHER_TABLE_STATS ('SCOTT', 'PRODUCTS')
PL/SQL procedure successfully completed.
SCOTT@10gXE>
SCOTT@10gXE> COLUMN prd_name      FORMAT A30
SCOTT@10gXE> COLUMN company_name FORMAT A10
SCOTT@10gXE> COLUMN prd_desc      FORMAT A8
SCOTT@10gXE> SELECT A.*, ROWNUM FROM
  2  (SELECT SCORE(1) AS SC,
  3  PRD_ID,
  4  PRD_NAME,
  5  COMPANY_NAME,
  6  ROW_NUMBER() OVER (PARTITION BY COMPANY_NAME ORDER BY SCORE(1) DESC) AS RK
  7  FROM PRODUCTS
  8  WHERE CONTAINS(DUMMY,'(((Candle Holders)*7, ($Candle $Holders)*5, (Candle% Holders%)*3) within PRD_NAME)'
  9  ,1) > 0 ) A
10  WHERE A.RK <= 3
11  ORDER BY A.COMPANY_NAME, SC DESC
12  /
        SC     PRD_ID PRD_NAME                       COMPANY_NA         RK     ROWNUM
        28          1 Glass Candle Holder            Comp1               1          1
        28          2 Iron Candle Holder             Comp1               2          2
        28          3 Metal Candle Holder            Comp2               1          3
        28          4 Votive Candle Holder           Comp3               1          4
        28          8 Platinum Coated Candle Holder  Comp4               1          5
        28          7 Copper Plated Candle Holder    Comp4               2          6
        28          6 Gold Plated Candle Holder      Comp4               3          7
7 rows selected.
SCOTT@10gXE> SELECT A.*, ROWNUM FROM
  2  (SELECT SCORE(1) AS SC,
  3  PRD_ID,
  4  PRD_NAME,
  5  COMPANY_NAME
  6  FROM PRODUCTS
  7  WHERE CONTAINS(DUMMY,'(((Candle Holders)*7, ($Candle $Holders)*5, (Candle% Holders%)*3) within PRD_NAME)'
  8  ,1) > 0 ) A
  9  ORDER BY A.COMPANY_NAME, SC DESC
10  /
        SC     PRD_ID PRD_NAME                       COMPANY_NA     ROWNUM
        28          1 Glass Candle Holder            Comp1               1
        28          2 Iron Candle Holder             Comp1               2
        28          3 Metal Candle Holder            Comp2               3
        28          4 Votive Candle Holder           Comp3               4
        28          5 Silver Plated Candle Holder    Comp4               5
        28          6 Gold Plated Candle Holder      Comp4               6
        28          7 Copper Plated Candle Holder    Comp4               7
        28          8 Platinum Coated Candle Holder  Comp4               8
8 rows selected.
SCOTT@10gXE> SELECT SCORE(1) AS SC,
  2           PRD_ID,
  3           PRD_NAME,
  4           COMPANY_NAME
  5  FROM   PRODUCTS
  6  WHERE  CONTAINS
  7             (DUMMY,
  8              '(((Candle Holders)*7,
  9            ($Candle $Holders)*5,
10            (Candle% Holders%)*3) within PRD_NAME)',
11              1) > 0
12  /
        SC     PRD_ID PRD_NAME                       COMPANY_NA
        28          1 Glass Candle Holder            Comp1
        28          2 Iron Candle Holder             Comp1
        28          3 Metal Candle Holder            Comp2
        28          4 Votive Candle Holder           Comp3
        28          5 Silver Plated Candle Holder    Comp4
        28          6 Gold Plated Candle Holder      Comp4
        28          7 Copper Plated Candle Holder    Comp4
        28          8 Platinum Coated Candle Holder  Comp4
8 rows selected.
SCOTT@10gXE> SELECT *
  2  FROM   (SELECT sc, prd_id, prd_name, company_name,
  3                ROW_NUMBER () OVER
  4                  (PARTITION BY company_name ORDER BY sc DESC) AS rk
  5            FROM   (SELECT SCORE(1) AS SC,
  6                     PRD_ID,
  7                     PRD_NAME,
  8                     COMPANY_NAME
  9                 FROM   PRODUCTS
10                 WHERE  CONTAINS
11                       (DUMMY,
12                        '(((Candle Holders)*7,
13                      ($Candle $Holders)*5,
14                      (Candle% Holders%)*3) within PRD_NAME)',
15                        1) > 0
16                 AND    ROWNUM > 0))
17  WHERE  rk <= 3
18  /
        SC     PRD_ID PRD_NAME                       COMPANY_NA         RK
        28          1 Glass Candle Holder            Comp1               1
        28          2 Iron Candle Holder             Comp1               2
        28          3 Metal Candle Holder            Comp2               1
        28          4 Votive Candle Holder           Comp3               1
        28          5 Silver Plated Candle Holder    Comp4               1
        28          6 Gold Plated Candle Holder      Comp4               2
        28          7 Copper Plated Candle Holder    Comp4               3
7 rows selected.
SCOTT@10gXE>