Question

new to oracle/DISCOVERER - WHERE condition is causing ORA-01468 - pred. may only ref 1 outer tbl

Asked by: mytfein

Hi EE,

I work for a university.
We have:
          a table: Course_Catalog - master table
          a table: Student_Course - contains all courses that a student took with their grades etc.

For some reason, both tables have a NumberOfCredits field.
At times, a course in the Student_Course table has credits that are diff. than the master table.

So, I wanted to write a Disco. query to catch these discrepancies.

So, I included the credits field from both tables.

BUT, when  i do a condition comparing credit_min (from master) to
                                                               course_credits (from detail)

get error msg:  ORA-01468 - predicate may only refer to 1 outer join table....

below screen shots,

any advice, pls, tx, sandra

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Asked On
2009-10-19 at 08:45:25ID24823915
Topic

Oracle Database

Participating Experts
1
Points
500
Comments
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Answers

 

by: mrjoltcolaPosted on 2009-10-19 at 09:05:53ID: 25606456

Which version of Oracle and which version of Discoverer?

Can you print the actual SQL query? It is possible that Discoverer is trying to write a full outer join with the old syntax. There are ways around it, but I am not sure with Discoverer, since I don't use it. One way is to use the ANSI join syntax, however, I am not sure you even need outer joins at all. If you just need to compare valid courses that differ in credits, then an INNER JOIN is adequate.

The query you are writing is simple to write if you need the SQL. If we provide the SQL for you can you plug it into Discoverer such that it is convenient for you to use? If so, can you provide your table descriptions?

Something like this...

select ...
from course_catalog a inner join student_course b on a.course_id = b.course_id
where a.credit_min <> b.course_credits
                                              
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by: mytfeinPosted on 2009-10-19 at 10:40:17ID: 25607264

Hi mr. jolt,

I agree that I need an inner join, and do not know why an outer join is set up between these 2 tables.
(i am not the Discov. admin, yet i have asked him in the past to create outer joins for me)

Anyway, the fact that you brought up OUTER JOINs reminded me of a Discov. peculiarity:

I learned at the oracle forum called OTN a few months ago, that you have to alert Discoverer
to use an outer join by doing this "fake out"
    , repeating the condition on the 2 tables that you like this in the Discoverer screen:

                ( Course_Credits <> Credit_Min OR Course_Credits <> Credit_Min )

then Discoverer knows that you are doing an outer join:

So now i ran the query, and do not have this error, but i have to check the results to see if my
approach is correct.

below is a screen shot of conditions:

in code window is the GENERATED sql behind the query.

will be back soon, to report my research of query results, tx, s






want outer joined twice.

SELECT DISTINCT  TO_CHAR(TO_DATE(TO_CHAR('31-MAY-'||TO_CHAR(TO_NUMBER(SUBSTR(o100049.ACADEMIC_PERIOD,1,4))+1))),'DD-MON-YYYY') as C_5,TO_CHAR('31-MAY-'||TO_CHAR(TO_NUMBER(SUBSTR(o100049.ACADEMIC_PERIOD,1,4))+1)) as C_4,CASE WHEN o100389.SUB_ACADEMIC_PERIOD = 'MCK' THEN '9' ELSE SUBSTR(o100389.COURSE_NUMBER,1,1) END as C_7,TO_CHAR(o100389.FINAL_GRADE_DATE,'mm/dd/yy') as C_1,o100389.SUBJECT||' '||o100389.COURSE_NUMBER as C_6,CASE WHEN o100389.FINAL_GRADE = 'C/P' THEN 'P' WHEN o100389.FINAL_GRADE = 'F/P' THEN 'P' ELSE o100389.FINAL_GRADE END as C_3,o100049.ACADEMIC_PERIOD as E101078,o100389.COURSE_CREDITS as E106300,o100389.COURSE_NUMBER as E106376,o100389.COURSE_TITLE_SHORT as E106421,o100389.CREDITS_PASSED as E106496,o100159.CREDIT_MIN as E106515,o100049.ENROLLED_IND as E108416,o100049.EXPECTED_GRADUATION_DATE as E108691,o100389.FINAL_GRADE_DATE as E108937,o100389.ID as E111144,o100389.NAME as E113936,o100049.REGISTERED_IND as E118389,o100389.REGISTRATION_STATUS as E118423,o100386.STUDENT_ATTRIBUTE as E120524,o100049.STUDENT_STATUS as E120689,o100389.SUBJECT as E120762,o100389.SUB_ACADEMIC_PERIOD as E120881,MAX(o100389.FINAL_GRADE_DATE) OVER(PARTITION BY ( o100389.SUBJECT||' '||o100389.COURSE_NUMBER )||o100389.ID ) as C_2
 
 FROM ODSMGR.ACADEMIC_STUDY o100049,
 
      ODSMGR.COURSE_CATALOG o100159,
 
      ODSMGR.STUDENT_ATTRIBUTE o100386,
 
      ODSMGR.STUDENT_COURSE o100389
 
 WHERE ( (o100389.PERSON_UID = o100049.PERSON_UID)
 
   and (o100386.PERSON_UID = o100389.PERSON_UID(+))
 
   and (o100389.COURSE_IDENTIFICATION = o100159.COURSE_IDENTIFICATION(+)))
 
   AND ( ( o100389.COURSE_CREDITS <> o100159.CREDIT_MIN OR o100389.COURSE_CREDITS <> o100159.CREDIT_MIN ) )
 
   AND (o100389.REGISTRATION_STATUS IN ('RE'))
 
   AND (( o100389.SUBJECT(+)||' '||o100389.COURSE_NUMBER(+) ) = :"Parm_CourseNumber")
 
   AND (o100049.STUDENT_STATUS IN ('AS'))
 
   AND (o100049.ACADEMIC_PERIOD = :"Parm_AcademicPeriod")
 
   AND (o100386.ACADEMIC_PERIOD = :"Parm_AcademicPeriod")
 
   AND (o100386.STUDENT_ATTRIBUTE = :"Parm_StudentAttribute")
 
 ORDER BY o100389.NAME ASC , CASE WHEN o100389.SUB_ACADEMIC_PERIOD = 'MCK' THEN '9' ELSE SUBSTR(o100389.COURSE_NUMBER,1,1) END ASC , o100389.FINAL_GRADE_DATE ASC , o100389.COURSE_NUMBER ASC ;
                                              
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by: mrjoltcolaPosted on 2009-10-19 at 10:53:04ID: 25607385

It is indeed using the old Oracle "non-ANSI" SQL joins.

I think you should remove the "fake out" and see what happens.

 

by: mytfeinPosted on 2009-10-19 at 11:57:51ID: 25607957

Hi mr. jolt,

truthfully, i like the syntax of INNER/OUTER JOINS, too

w/o the fakeout, i get the oracle error msg...

i checked my results set, and it's fine....

i think i will go to OTN Discoverer to confirm .... this "fakeout" is not documented and i think Discoverer
did this to make it easier for non-pgmrs to use, but for people with a db background, will be horrified
that Discoverer has its own db technique, so its not intuitive to someone from another db background
to use ....

tx, s

20120131-EE-VQP-002

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