ROWNUM returns which you would naturally expect when it is used with an ORDER BY on a very large result set?

For security reasons, I removed the column names and the name of the table to this request, but there is no WHERE clause, and this includes the ORDER byclause complete.

Select p.cc,

p.yy,

p.mm,

p.DD,

p.ref_no,

p.seconds,

p.deci_mal,

Cast (rownum as number (14)) as arpds_id

p

order of p.cc,

p.yy,

p.mm,

p.DD,

p.ref_no,

p.seconds,

p.deci_mal

;

The table containing the former payments, which took thousands of lines, where each column is the same and had over 15 million total lines, we have add a primary key (ARPDS_ID).

I expected the ROWNUM to represent the line number * after * the lines are sorted by the ORDER BY clause.  However, we have identified at least one account if it wasn't the case.

Here's the relevant fields for this account, sort by my ARPDS_ID.  As you can see, the second row has clearly a REF_NO higher, but an ARPDS_ID lower than the third row.

CC AA MM JJ REF_NO SECONDS DECI_MAL ARPDS_ID

-- -- -- -- ------ ------- -------- ---------------

20 13 05 25 1258 57 00 15584205

20 13 06 04 1718 56 00 15669414

20 13 06 04 1711 48 00 15682078

Can someone help me understand why this has happened?  I didn't when it was first brought to my attention, and the database restored which contained the tmp table real (global temporary not) we have created with the query above, so I can prove me as the above query * actually * created these results.  Is that I saw it with my own eyes I thought this happened.

Thank you

Post edited by: mattknowles PS - What happened to the Post Preview feature?  Am I just not see it?

Hello

Everything you would expect of course, ROWNUM is probably not do.

ROWNUM is assigned as lines are taken from the table (or subquery), before the ORDER BY clause.

If you want to ROWNUM to reflect a particular order, then an ORDER BY in a subquery and use ROWNUM in the Super request,

WITH ordered_data AS

(

SELECT cc yy, mm, DD, ref_no, seconds, deci_mal

P

ORDER BY cc, yy, mm, DD, ref_no, seconds, deci_mal

)

SELECT o.*

CAST (ROWNUM AS NUMBER (14)) AS arpds_id

Of ordered_data o

;

If the problem is more complicated than what you have posted, you can use the analytic ROW_NUMBER function instead of ROWNUM.

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