RE: Help with SQL & Aggregate Functions

From: Lisa R. Clary <lisa_at_cog.ufl.edu>
Date: Thu, 30 May 2002 09:57:05 -0800
Message-ID: <F001.0046FE4A.20020530095705@fatcity.com>

Here is the query re-write that works--basically just moved the group by to its own select. The only thing that would prevent the error message was to remove the count().

REWRITTEN code below that works--still don't have an answer for the original question.

select s.study_id, s.strat_code, s.short_name, nvl(o.total,0) TOTAL from (select count (*) total, study_id, stratum from on_study group by study_id, stratum) o,

     regdba.reg_stratum s,
      regdba.study y
where y.stat_center_code in (1,7) and
      s.study_id = o.study_id(+) and
      s.study_id = y.study_id and
      s.strat_code = o.stratum (+)

order by s.study_id desc, s.strat_code;

-----Original Message-----
Clary
Sent: Thursday, May 30, 2002 1:24 PM
To: Multiple recipients of list ORACLE-L

I am having a hard time understanding why removing the line "y.date_accrual_close is not null and" generates the error "ERROR:ORA-24347: Warning of a NULL column in an aggregate function" and returns 0 rows. I can re-write the query to get it to do what I need, but I don't understand why this value has anything to do with the count/group by....so what if it is null? there are other fields in the regdba.study table that are null..

I did RTFM, but saw nothing that applied---date_accrual_close is neither in the select nor in the group by.

Thanks for your input!
lc

select s.study_id, s.strat_code, s.short_name,

                             count(o.study_id)
                      from rdedba.on_study o,
                           regdba.reg_stratum s,
                           regdba.study y
                      where y.stat_center_code in (1,7) and
                            y.study_type_code <> 7 and
                            y.date_accrual_close is not null and
                            s.study_id = o.study_id(+) and
                            NVL(s.strat_code,0) = NVL(o.stratum(+),0) and
                            s.study_id = y.study_id
                      group by s.study_id, s.strat_code, s.short_name
                      order by s.study_id desc, s.strat_code;

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Author: Lisa R. Clary
  INET: lisa_at_cog.ufl.edu

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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Lisa R. Clary
  INET: lisa_at_cog.ufl.edu

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San Diego, California        -- Public Internet access / Mailing Lists
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Received on Thu May 30 2002 - 12:57:05 CDT