Ambiguous Column Naming Error In Query

I'm getting a strange Oracle error when I try and run a (relatively)
straightforward query.
This is the error I get:
ORA-12801: error signaled in parallel query server P000
ORA-00960: ambiguous column naming in select list
This is the query that Kodo is generating:
SELECT DISTINCT
     t0.EVENT_ID, t0.ACTIVE_YN, t0.CREAT_BY, t0.CREAT_DT,
t0.REPORTED_CURNCY_CD,
     t0.PUB_DESCR_TX, t0.FREQUENCY, t0.MOD_BY, t0.MOD_DT, t0.EVENT_NAME,
t0.CLI_ID,
     t0.ORG_UNIT_ID, t0.RATING_CD, t0.TOTAL_MONEY, t0.RISK_CLASS_ID, t0.TYPE,
     t0.STATUS_ID, t0.LOSS_LOC_CUR, t0.EVENT_TYPE, t0.EVENT_NAME
FROM
     DEF_EVENT_DATE t2, EVENT t0, EVENT_DATE t1
WHERE
     (((t2.DATE_TYPE_CD = 'Start Occurrence Date' AND
     t1.VALUE_DT <= {ts '2002-10-09 14:17:02.422'}) AND
     t0.CLI_ID = 2963) AND
     t0.EVENT_ID = t1.EVENT_ID AND
     t1.DATE_TYPE_CD = t2.DATE_TYPE_CD)
ORDER BY
     t0.EVENT_NAME ASC
t0.EVENT_NAME is being selected twice. I am guessing this has something to
do with the ORDER BY clause.
But in conjunction with the DISTINCT keyword this is breaking the query.
This can be shown in the following simple example:
SELECT DISTINCT
     t0.EVENT_NAME, t0.EVENT_NAME
FROM
     EVENT t0
ORDER BY
     t0.EVENT_NAME ASC;
This throws the same 'ambiguous column' error as before.
My question is why is the DISTINCT keyword being used in this query and
how do I fix it?
Thanks in advance,
Simon

i'm not sure,
but the problem you reported tends to be an oracle problem.
(selecting a column twice should be not a problem)
the ORA-error you reported is a parallel query error ...
and parallel queries are bound to some special conditions ...
try: alter table <table> parallel 1
and apply your test again.
"Simon Horne" <[email protected]> schrieb im Newsbeitrag
news:ao1js8$i6r$[email protected]..
I'm getting a strange Oracle error when I try and run a (relatively)
straightforward query.
This is the error I get:
ORA-12801: error signaled in parallel query server P000
ORA-00960: ambiguous column naming in select list
This is the query that Kodo is generating:
SELECT DISTINCT
t0.EVENT_ID, t0.ACTIVE_YN, t0.CREAT_BY, t0.CREAT_DT,
t0.REPORTED_CURNCY_CD,
t0.PUB_DESCR_TX, t0.FREQUENCY, t0.MOD_BY, t0.MOD_DT, t0.EVENT_NAME,
t0.CLI_ID,
t0.ORG_UNIT_ID, t0.RATING_CD, t0.TOTAL_MONEY, t0.RISK_CLASS_ID, t0.TYPE,
t0.STATUS_ID, t0.LOSS_LOC_CUR, t0.EVENT_TYPE, t0.EVENT_NAME
FROM
DEF_EVENT_DATE t2, EVENT t0, EVENT_DATE t1
WHERE
(((t2.DATE_TYPE_CD = 'Start Occurrence Date' AND
t1.VALUE_DT <= {ts '2002-10-09 14:17:02.422'}) AND
t0.CLI_ID = 2963) AND
t0.EVENT_ID = t1.EVENT_ID AND
t1.DATE_TYPE_CD = t2.DATE_TYPE_CD)
ORDER BY
t0.EVENT_NAME ASC
t0.EVENT_NAME is being selected twice. I am guessing this has something to
do with the ORDER BY clause.
But in conjunction with the DISTINCT keyword this is breaking the query.
This can be shown in the following simple example:
SELECT DISTINCT
t0.EVENT_NAME, t0.EVENT_NAME
FROM
EVENT t0
ORDER BY
t0.EVENT_NAME ASC;
This throws the same 'ambiguous column' error as before.
My question is why is the DISTINCT keyword being used in this query and
how do I fix it?
Thanks in advance,
Simon

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