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Question and Answer

Chris Saxon

Thanks for the question.

Asked: March 22, 2017 - 2:55 pm UTC

Last updated: March 23, 2017 - 2:14 pm UTC

Version: 11.2.0.4

Viewed 1000+ times

You Asked

Hello,

select rn, code, max(code) over () as mcode from
(
select 1 as rn, '1C538454-D89A-E211-88D1-1CC1DEE781E4' as code from dual
    union all
select 2 as rn, 'C5FAEF8F-D1B0-E211-A69F-1CC1DEE781E4' as code from dual
)
order by code asc

result:
RN CODE MCODE
2 C5FAEF8F-D1B0-E211-A69F-1CC1DEE781E4 C5FAEF8F-D1B0-E211-A69F-1CC1DEE781E4
1 1C538454-D89A-E211-88D1-1CC1DEE781E4 C5FAEF8F-D1B0-E211-A69F-1CC1DEE781E4


Why does ORDER BY ASC get first with MAX value of code?

Thanks!

and Chris said...

That's not the behaviour I see when using 11.2.0.4, the results are ordered by code ascending as you'd expect:

SQL> select * from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
PL/SQL Release 11.2.0.4.0 - Production
CORE    11.2.0.4.0      Production
TNS for Linux: Version 11.2.0.4.0 - Production
NLSRTL Version 11.2.0.4.0 - Production

SQL>
SQL> select rn, code, max(code) over () as mcode from
  2  (
  3  select 1 as rn, '1C538454-D89A-E211-88D1-1CC1DEE781E4' as code from dual
  4      union all
  5  select 2 as rn, 'C5FAEF8F-D1B0-E211-A69F-1CC1DEE781E4' as code from dual
  6  )
  7  order by code asc;

        RN CODE                                 MCODE
---------- ------------------------------------ ------------------------------------
         1 1C538454-D89A-E211-88D1-1CC1DEE781E4 C5FAEF8F-D1B0-E211-A69F-1CC1DEE781E4
         2 C5FAEF8F-D1B0-E211-A69F-1CC1DEE781E4 C5FAEF8F-D1B0-E211-A69F-1CC1DEE781E4


So:

- what version exactly are you using?
- What are you using to view the results?
- Is it possible your client is sorting the data after you fetch it?

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Comments

I've got it: it depends on nls_sort

Serj, March 23, 2017 - 11:52 am UTC

Thanks for your response.
I've got it: it depends on nls_sort. I used russian nls parameters by default. But I seems strange max and order use different settings.

Chris Saxon
March 23, 2017 - 2:14 pm UTC

I thought there must be something else going on!

If you share your test case (including your NLS settings) we can look further
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