IN A NATURAL JOIN THE ANSWER QUERY DEPENDS OF PROJECTION ??!!

Hi,
Related to this question
Link: problems with natural join
Does the answer query depend of projection in a complex NATURAL JOIN query?
Thanks,
Ion

You are most likely encountering this bug:
Bug 5031632 - Wrong results from NATURAL JOIN, Metalink Note: 5031632.8
It currently affects all versions of Oracle.
You can tell something weird is going on by the EXPLAIN PLAN results:
Query:
SELECT     *
FROM     BOOK
NATURAL JOIN
     AUTHORSHIP
     NATURAL JOIN
          AUTHOR
          NATURAL JOIN
          COUNTRY
WHERE     COUNTRY.NAMECOUNTRY = 'Canada'
Explain Plan:
SQL> /
PLAN_TABLE_OUTPUT
Plan hash value: 3878360587
| Id | Operation        | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT |      |     1 |    39 |    28   (8)| 00:00:01 |
|* 1 | HASH JOIN       |      |     1 |    39 |    28   (8)| 00:00:01 |
|* 2 |   HASH JOIN      |      |     1 |    29 |    17   (6)| 00:00:01 |
|* 3 |    HASH JOIN     |      |     1 |    23 |     9 (12)| 00:00:01 |
|   4 |     VIEW         |      |     2 |    16 |     2   (0)| 00:00:01 |
|   5 |      UNION-ALL   |      |       |       |            |          |
|   6 |       FAST DUAL |      |     1 |       |     2   (0)| 00:00:01 |
|* 7 |       FILTER     |      |       |       |            |          |
|   8 |        FAST DUAL |      |     1 |       |     2   (0)| 00:00:01 |
|   9 |     VIEW         |      |     3 |    45 |     6   (0)| 00:00:01 |
| 10 |      UNION-ALL   |      |       |       |            |          |
| 11 |       FAST DUAL |      |     1 |       |     2   (0)| 00:00:01 |
| 12 |       FAST DUAL |      |     1 |       |     2   (0)| 00:00:01 |
| 13 |       FAST DUAL |      |     1 |       |     2   (0)| 00:00:01 |
| 14 |    VIEW          |      |     4 |    24 |     8   (0)| 00:00:01 |
| 15 |     UNION-ALL    |      |       |       |            |          |
| 16 |      FAST DUAL   |      |     1 |       |     2   (0)| 00:00:01 |
| 17 |      FAST DUAL   |      |     1 |       |     2   (0)| 00:00:01 |
| 18 |      FAST DUAL   |      |     1 |       |     2   (0)| 00:00:01 |
| 19 |      FAST DUAL   |      |     1 |       |     2   (0)| 00:00:01 |
| 20 |   VIEW           |      |     5 |    50 |    10   (0)| 00:00:01 |
| 21 |    UNION-ALL     |      |       |       |            |          |
| 22 |     FAST DUAL    |      |     1 |       |     2   (0)| 00:00:01 |
| 23 |     FAST DUAL    |      |     1 |       |     2   (0)| 00:00:01 |
| 24 |     FAST DUAL    |      |     1 |       |     2   (0)| 00:00:01 |
| 25 |     FAST DUAL    |      |     1 |       |     2   (0)| 00:00:01 |
| 26 |     FAST DUAL    |      |     1 |       |     2   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   1 - access("BOOK"."IDBOOK"="AUTHORSHIP"."IDBOOK")
   2 - access("AUTHORSHIP"."IDAUTHOR"="AUTHOR"."IDAUTHOR")
   3 - access("AUTHOR"."IDCOUNTRY"="COUNTRY"."IDCOUNTRY")
   7 - filter(NULL IS NOT NULL)
Query:
SELECT     NAMEBOOK
FROM     BOOK
NATURAL JOIN
     AUTHORSHIP
     NATURAL JOIN
          AUTHOR
          NATURAL JOIN
          COUNTRY
WHERE     COUNTRY.NAMECOUNTRY = 'Canada'
Explain Plan:
SQL> /
PLAN_TABLE_OUTPUT
Plan hash value: 3246924444
| Id | Operation             | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT      |      |     1 |    24 |    27   (4)| 00:00:01 |
|* 1 | HASH JOIN            |      |     1 |    24 |    27   (4)| 00:00:01 |
|   2 |   MERGE JOIN CARTESIAN|      |     1 |    21 |    19   (6)| 00:00:01 |
|* 3 |    HASH JOIN          |      |     1 |    11 |     9 (12)| 00:00:01 |
|   4 |     VIEW              |      |     2 |    16 |     2   (0)| 00:00:01 |
|   5 |      UNION-ALL        |      |       |       |            |          |
|   6 |       FAST DUAL       |      |     1 |       |     2   (0)| 00:00:01 |
|* 7 |       FILTER          |      |       |       |            |          |
|   8 |        FAST DUAL      |      |     1 |       |     2   (0)| 00:00:01 |
|   9 |     VIEW              |      |     3 |     9 |     6   (0)| 00:00:01 |
| 10 |      UNION-ALL        |      |       |       |            |          |
| 11 |       FAST DUAL       |      |     1 |       |     2   (0)| 00:00:01 |
| 12 |       FAST DUAL       |      |     1 |       |     2   (0)| 00:00:01 |
| 13 |       FAST DUAL       |      |     1 |       |     2   (0)| 00:00:01 |
| 14 |    BUFFER SORT        |      |     5 |    50 |    19   (6)| 00:00:01 |
| 15 |     VIEW              |      |     5 |    50 |    10   (0)| 00:00:01 |
| 16 |      UNION-ALL        |      |       |       |            |          |
| 17 |       FAST DUAL       |      |     1 |       |     2   (0)| 00:00:01 |
| 18 |       FAST DUAL       |      |     1 |       |     2   (0)| 00:00:01 |
| 19 |       FAST DUAL       |      |     1 |       |     2   (0)| 00:00:01 |
| 20 |       FAST DUAL       |      |     1 |       |     2   (0)| 00:00:01 |
| 21 |       FAST DUAL       |      |     1 |       |     2   (0)| 00:00:01 |
| 22 |   VIEW                |      |     4 |    12 |     8   (0)| 00:00:01 |
| 23 |    UNION-ALL          |      |       |       |            |          |
| 24 |     FAST DUAL         |      |     1 |       |     2   (0)| 00:00:01 |
| 25 |     FAST DUAL         |      |     1 |       |     2   (0)| 00:00:01 |
| 26 |     FAST DUAL         |      |     1 |       |     2   (0)| 00:00:01 |
| 27 |     FAST DUAL         |      |     1 |       |     2   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   1 - access("BOOK"."IDBOOK"="AUTHORSHIP"."IDBOOK")
   3 - access("AUTHOR"."IDCOUNTRY"="COUNTRY"."IDCOUNTRY")
   7 - filter(NULL IS NOT NULL)
41 rows selected.There are two major differences in these plans.
1. The correct result has HASH JOINS. However the incorrect result has a MERGE JOIN CARTESIAN. A cartesian join should not be here as there is no need for one per the table structure and NATURAL JOIN syntax.
2. There is a filter condition missing in the predicate information session.
Both #1 and #2 above point to the bug I identified. The current work around us to use the JOIN ... ON syntax.
HTH!

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To join the sql query

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==============
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How join the two query block with same field

sorry sir i am posting dublicate thread
i thought you not understand my question
sir i have two query block in report with same field
i try the link object but that creat now block not creat link withen query block
please give me idea
thank

Dear,
Use data link object.
Click at data link object then click on the fild in query block1 and drag it into the other query block data link will be created.
try it

Query based on "NATURAL JOIN" statement of Oracle9i

I have created following 4 tables
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Hallo,
yes you are correct.
From SQL Reference
NATURAL JOIN The NATURAL keyword indicates that a natural join is being performed. A natural join is based on all columns in the two tables that have the same name. It selects rows from the two tables that have equal values in the relevant columns
Nothing about foreign keys.
Test:
select * from scott.emp natural join scott.dept
    DEPTNO      EMPNO ENAME      JOB               MGR HIREDATE                  SAL       COMM DNAME          LOC
        20           7369     SMITH          CLERK                7902     17.12.1980            800                    RESEARCH           DALLAS
        30           7499     ALLEN          SALESMAN            7698     20.02.1981           1600            300     SALES              CHICAGO
        30           7521     WARD           SALESMAN            7698     22.02.1981           1250            500     SALES              CHICAGO
        20           7566     JONES          MANAGER              7839     02.04.1981           2975                    RESEARCH           DALLAS
        30           7654     MARTIN         SALESMAN            7698     28.09.1981           1250           1400     SALES              CHICAGO
        30           7698     BLAKE          MANAGER              7839     01.05.1981           2850                    SALES              CHICAGO
        10           7782     CLARK          MANAGER              7839     09.06.1981           2450                    ACCOUNTING         NEW YORK
        20           7788     SCOTT          ANALYST              7566     19.04.1987           3000                    RESEARCH           DALLAS
        10           7839     KING           PRESIDENT                     17.11.1981           5000                    ACCOUNTING         NEW YORK
        30           7844     TURNER         SALESMAN            7698     08.09.1981           1500              0     SALES              CHICAGO
        20           7876     ADAMS          CLERK                7788     23.05.1987           1100                    RESEARCH           DALLAS
        30           7900     JAMES          CLERK                7698     03.12.1981            950                    SALES              CHICAGO
        20           7902     FORD           ANALYST              7566     03.12.1981           3000                    RESEARCH           DALLAS
        10           7934     MILLER         CLERK                7782     23.01.1982           1300                    ACCOUNTING         NEW YORK
alter table scott.emp drop constraint fk_deptno
select * from scott.emp natural join scott.dept
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        20           7369     SMITH          CLERK                7902     17.12.1980            800                    RESEARCH           DALLAS
        30           7499     ALLEN          SALESMAN            7698     20.02.1981           1600            300     SALES              CHICAGO
        30           7521     WARD           SALESMAN            7698     22.02.1981           1250            500     SALES              CHICAGO
        20           7566     JONES          MANAGER              7839     02.04.1981           2975                    RESEARCH           DALLAS
        30           7654     MARTIN         SALESMAN            7698     28.09.1981           1250           1400     SALES              CHICAGO
        30           7698     BLAKE          MANAGER              7839     01.05.1981           2850                    SALES              CHICAGO
        10           7782     CLARK          MANAGER              7839     09.06.1981           2450                    ACCOUNTING         NEW YORK
        20           7788     SCOTT          ANALYST              7566     19.04.1987           3000                    RESEARCH           DALLAS
        10           7839     KING           PRESIDENT                     17.11.1981           5000                    ACCOUNTING         NEW YORK
        30           7844     TURNER         SALESMAN            7698     08.09.1981           1500              0     SALES              CHICAGO
        20           7876     ADAMS          CLERK                7788     23.05.1987           1100                    RESEARCH           DALLAS
        30           7900     JAMES          CLERK                7698     03.12.1981            950                    SALES              CHICAGO
        20           7902     FORD           ANALYST              7566     03.12.1981           3000                    RESEARCH           DALLAS
        10           7934     MILLER         CLERK                7782     23.01.1982           1300                    ACCOUNTING         NEW YORK
ALTER TABLE scott.emp
ADD CONSTRAINT fk_deptno FOREIGN KEY (deptno)
REFERENCES SCOTT.dept (deptno)
ENABLE NOVALIDATE
/Regards
Dmytro Dekhtyaryuk

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Hello,
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I am trying to build a report based on columns from 3 dimensions.
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If i add a filter condition from say D1 on the report like D1.Col = <something> on the answers report, the physical
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Thank You

hi..
First tell me all dimensions are left outer with fact?
Then, check your fact table LTS levels..
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The following query returns what I expect from the HR schema [106 rows]:
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Thanks.

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Gana

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Hi,
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Ok.
I assume that you have for one activity several asset PNR and for one asset several activity.
The factPNR is on this way a real bridge table. It's a way to be able to design a many-to-many relationship.
Have a look here for more detail on how to build a many-to-many relationship :
http://gerardnico.com/wiki/dw/data_quality/relationships#many-to-many
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DimActivity -< FactActivity >- < FactPNR >- DimPNR and you will have :
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A complete example here :
http://gerardnico.com/wiki/dat/obiee/obiee_bridge_table

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Hi all!
I have three table in Univerce.
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http://www.dba-oracle.com/t_outer_joins.htm
good luck
Amr

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Qest:
Write the following query using JOIN keyword ?
select ID_category from category_master X
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X.ID_category=Y.ID_category)Edited by: 799660 on Oct 3, 2010 6:05 AM

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Hi All,
while checking my new COPA datasource in RSA3, I get the Error message No source could be found to answer the search query Message no RD155.
I have maintained the summarization levels which is in a status of "Active Without Data". Also note, the tables for CE1XXXX, CE2XXXX & CE3XXXX do not contain data. However, CE4XXXX table does contain data.
Kindly help.... its very very important and i need to finish this datasource ASAP

Hi
I am unable to implement both the notes as I am already on a higher version of PI_BASIS.
I have replicated my datasource into the BW system..
While doing the INIT load without DATA TRANSFER, i do not get any error message, however, while doing a Delta it does not bring in any records but does not fail as well
However, if i delete the initialization selections and load the data using the setting INITIALIZATION WITH DATA TRANSFER or Full UPDATE, the data load fails with the ERROR MESSAGE "Errors occurred in data selection."
Please help... This issue is very very important and i need to deliver it ASAP
Edited by: Sneha Santhanakrishnan on Jun 24, 2010 9:29 AM

Natural Join multiple tables bug!! SQLPLus 10.1.0.4.2

SQLPLus 10.1.0.4.2 bug detected!! Who knows how to fix it? Many thanks
I'm experimenting with natural join and found some really strange behaviour when I tried to combine multiple natural joins.
I have the following schema:
Model (ModelID PK, brand, type, year), 49 records
Car (CarID PK, ModelID FK, OwnerID FK, price) 60 records
Owner (OwnerID PK, name, adres) 48 records
The database system is Oracle 10g 64bit on Windows 2003 64bit
The following query gives me the result I expect (29 records):
SELECT * FROM Owner NATURAL JOIN Car NATURAL JOIN Model
WHERE brand='Volkswagen'
However when I start specifying columns in the select clause the number of records in the result differs depending on the columns I select:
SELECT OwnerID FROM Owner NATURAL JOIN Car NATURAL JOIN Model
WHERE brand='Volkswagen'
--> 1260 records
SELECT OwnerID, CarID FROM Owner NATURAL JOIN Car NATURAL JOIN Model WHERE brand='Volkswagen'
--> 1260 records
SELECT ModelID FROM Owner NATURAL JOIN Car NATURAL JOIN Model
WHERE brand='Volkswagen'
--> 29 records (as expected).
Would this be caused by a bug in Oracle or is there a logical explanation?
TIA,
Axel Hallez

Duplicate thread:
Natural Join bug!! Is this a sqlplus bug, how to fix it?

IN A NATURAL JOIN THE ANSWER QUERY DEPENDS OF PROJECTION ??!!

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