ORA-00918: column ambiguously defined

Hi
Why am I getting the following error when all columns are prefixed with table names???
See Code for view definition

ORA-00918: column ambiguously defined
00918. 00000 -  "column ambiguously defined"
*Cause:    
*Action:
Error at Line: 32 Column: 18
CREATE OR REPLACE FORCE VIEW  xxkp_ctp_det_gr_v	 	(AU_SID
						 	,AU_ID
							,AU_NAME
							,ACTIVITY_ID
							,ACTIVITY_NAME
						 	,WORKGROUP_ID
                                                 	,WORKGROUP_NAME
						 	,USER_ID
						 	,USERNAME
						 	,FIRST_NAME
						 	,LAST_NAME
						 	,SUBJECT_COMPLETE
						 	,POSTASSESS_COMPLETE
							,BOTH_COMPLETE
						 	,SCORE
						 	,POSTASSESS_REQUIRED_SCORE
							,PASSED
							,XFAILED
							,NOT_STARTED
							,SUBJECT_IN_PROGRESS
							,POSTASSESS_IN_PROGRESS
						 	) 
AS 

SELECT		XXKP_CTP_DET_V.AU_SID
,		XXKP_CTP_DET_V.AU_ID
,		XXKP_CTP_DET_V.AU_NAME
,		XXKP_CTP_DET_V.ACTIVITY_NAME
,		XXKP_CTP_DET_V.WORKGROUP_ID
, 		XXKP_CTP_DET_V.WORKGROUP_NAME
, 		XXKP_CTP_DET_V.USER_ID
, 		XXKP_CTP_DET_V.USERNAME
, 		XXKP_CTP_DET_V.FIRST_NAME
, 		XXKP_CTP_DET_V.LAST_NAME
, 		COUNT(DISTINCT(XXKP_CTP_DET_V.ASSESS_RESULT_ID)) AS NO_OF_POSTASSESS_ATTEMPTS
,		CASE WHEN SUM(CASE WHEN XXKP_CTP_DET_V.SUBJECT_COMPLETE = 1 THEN 1 ELSE 0 END) > 0 
		THEN 1 ELSE 0 END AS SUBJECT_COMPLETE
, 		CASE WHEN SUM(CASE WHEN XXKP_CTP_DET_V.POSTASSESS_COMPLETE = 1 THEN 1 ELSE 0 END) > 0 
		THEN 1 ELSE 0 END AS POSTASSESS_COMPLETE
, 		CASE WHEN (CASE WHEN SUM(CASE WHEN XXKP_CTP_DET_V.SUBJECT_COMPLETE = 1 THEN 1 ELSE 0 END) > 0 
		THEN 1 ELSE 0 END) = 1 AND 
		(CASE WHEN SUM(CASE WHEN XXKP_CTP_DET_V.POSTASSESS_COMPLETE = 1 THEN 1 ELSE 0 END) > 0 
		THEN 1 ELSE 0 END) = 1 THEN 1 ELSE 0 END AS BOTH_COMPLETE
, 		CASE WHEN MAX(XXKP_CTP_DET_V.SCORE * 100) IS NULL THEN 0 ELSE MAX(XXKP_CTP_DET_V.SCORE * 100) END AS SCORE
, 		CASE WHEN MAX(XXKP_CTP_DET_V.POSTASSESS_REQUIRED_SCORE * 100) IS NULL 
		THEN 0 ELSE MAX(XXKP_CTP_DET_V.POSTASSESS_REQUIRED_SCORE * 100) END AS POSTASSESS_REQUIRED_SCORE
, 		CASE WHEN SUM(CASE WHEN XXKP_CTP_DET_V.PASSED = 1 THEN 1 ELSE 0 END) > 0 THEN 1 ELSE 0 END AS PASSED
,		CASE WHEN SUM(CASE WHEN XXKP_CTP_DET_V.PASSED = 1 THEN 1 ELSE 0 END) = 0 
		AND SUM(CASE WHEN XXKP_CTP_DET_V.XFAILED = 1 THEN 1 ELSE 0 END) > 0 THEN 1 ELSE 0 END AS XFAILED
, 		CASE WHEN SUM(CASE WHEN XXKP_CTP_DET_V.SUBJECT_COMPLETE_PERCENTAGE IS NULL THEN 0 ELSE 1 END) = 0 AND 
		(SUM(CASE WHEN XXKP_CTP_DET_V.SCORE IS NULL THEN 0 ELSE 1 END) = 0) THEN 1 ELSE 0 END AS NOT_STARTED
,		CASE WHEN SUM(XXKP_CTP_DET_V.SUBJECT_IN_PROGRESS) > 0 AND 
		(CASE WHEN SUM(CASE WHEN XXKP_CTP_DET_V.SUBJECT_COMPLETE = 1 THEN 1 ELSE 0 END) > 0 THEN 1 ELSE 0 END) <> 1 
		THEN 1 ELSE 0 END AS SUBJECT_IN_PROGRESS
, 		CASE WHEN SUM(XXKP_CTP_DET_V.POSTASSESS_IN_PROGRESS) > 0 AND 
		(CASE WHEN SUM(CASE WHEN XXKP_CTP_DET_V.POSTASSESS_COMPLETE = 1 THEN 1 ELSE 0 END) > 0 THEN 1 ELSE 0 END) <> 		1 THEN 1 ELSE 0 END AS POSTASSESS_IN_PROGRESS


FROM       	XXKP_CTP_DET_V
GROUP BY	XXKP_CTP_DET_V.AU_SID
, 		XXKP_CTP_DET_V.AU_ID
, 		XXKP_CTP_DET_V.AU_NAME
, 		XXKP_CTP_DET_V.ACTIVITY_NAME
, 		XXKP_CTP_DET_V.WORKGROUP_ID
, 		XXKP_CTP_DET_V.WORKGROUP_NAME
, 		XXKP_CTP_DET_V.USER_ID
, 		XXKP_CTP_DET_V.USERNAME
, 		XXKP_CTP_DET_V.FIRST_NAME
, 		XXKP_CTP_DET_V.LAST_NAME

/

EXIT

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timpoynterAsked:
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MilleniumaireCommented:
You will get this error when you reference a column that exists in more than one table.

Introduce a table alias and then qualify the column name with the alias.  This way you tell Oracle exactly which table the column should be taken from

e.g.

select t1.col,
          t2.col
from table1 t1,
        table 2 t2
neeraj523Commented:
prefix table name to all the columns referred in select statement
timpoynterAuthor Commented:
Hi

Thanks for the responses, but I am only querying one view and every column is prefixed (I think) please have a look at the code
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neeraj523Commented:
try to run select statement only and see if it gives error.. if so, try to removing few parts of the query to debug the actual problem in it
timpoynterAuthor Commented:
I have its this element it doesn't like

CASE WHEN SUM(XXKP_CTP_DET_V.POSTASSESS_IN_PROGRESS) > 0 AND  
                (CASE WHEN SUM(CASE WHEN XXKP_CTP_DET_V.POSTASSESS_COMPLETE = 1 THEN 1 ELSE 0 END) > 0 THEN 1 ELSE 0 END) <>            1 THEN 1 ELSE 0 END AS POSTASSESS_IN_PROGRESS
 
As you can see everything is prefixed!

Any ideas???
MilleniumaireCommented:
You say you are querying a view.  Is it possible the view itself is causing the problem i.e. the view retrieves from multiple tables but isn't correctly prefixing the columns?
neeraj523Commented:
can check if this works for you

SELECT * FROM XXKP_CTP_DET_V

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timpoynterAuthor Commented:
neeraj523

Thank you so much, when I did a select * I could see that there were an invalid number of columns of the view I was selecting from, fixed that and now the query works

Thanks
neeraj523Commented:
great to know that you were able to resolve the issue..

all the best
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