Is that important column order in a query with row_number function

Hi folks,
I am using Oracle 11g R2 on HP-UX machine.
I have 2 types of query with row_number and I think they are same but output of each of them are different. I changed only column order in query2.
Query 1 :
(SELECT
"LOOKUP_INPUT_SUBQUERY"."CONTRACT_SK" "CONTRACT_SK",
"LOOKUP_INPUT_SUBQUERY"."SIMCARD_SK" "SIMCARD_SK"
FROM (
SELECT row_number ()
OVER (
PARTITION BY "R_CON_SUBS_SIMCARD_LK".
"CONTRACT_SK"
ORDER BY
"R_CON_SUBS_SIMCARD_LK"."START_DATE" DESC,
"R_CON_SUBS_SIMCARD_LK"."SEQ_NUM" DESC NULLS LAST) /* EXPRESSION_3.OUTGRP1.SIRA */
"SIRA",
"R_CON_SUBS_SIMCARD_LK"."CONTRACT_SK" "CONTRACT_SK",
"R_CON_SUBS_SIMCARD_LK"."SIMCARD_SK" "SIMCARD_SK"
FROM "SRC_OZRDS"."R_CON_SUBS_SIMCARD_LK" "R_CON_SUBS_SIMCARD_LK")
"LOOKUP_INPUT_SUBQUERY"
WHERE ("LOOKUP_INPUT_SUBQUERY"."SIRA" = 1))
Output of this like that :
CONTRACT_SK SIMCARD_SK
1     1
1     3
1     4
1     5
1     6
1     11
1     12
1     14
1     15
1     16
Query 2 :
(SELECT
"LOOKUP_INPUT_SUBQUERY"."CONTRACT_SK" "CONTRACT_SK",
"LOOKUP_INPUT_SUBQUERY"."SIMCARD_SK" "SIMCARD_SK"
FROM (
SELECT
"R_CON_SUBS_SIMCARD_LK"."CONTRACT_SK" "CONTRACT_SK",
"R_CON_SUBS_SIMCARD_LK"."SIMCARD_SK" "SIMCARD_SK",
row_number ()
OVER (
PARTITION BY "R_CON_SUBS_SIMCARD_LK".
"CONTRACT_SK"
ORDER BY
"R_CON_SUBS_SIMCARD_LK"."START_DATE" DESC,
"R_CON_SUBS_SIMCARD_LK"."SEQ_NUM" DESC NULLS LAST) /* EXPRESSION_3.OUTGRP1.SIRA */
"SIRA"
FROM "SRC_OZRDS"."R_CON_SUBS_SIMCARD_LK" "R_CON_SUBS_SIMCARD_LK")
"LOOKUP_INPUT_SUBQUERY"
WHERE ("LOOKUP_INPUT_SUBQUERY"."SIRA" = 1))
Output of this like that:
2     874812
7     70097256
8     18734091
9     158024
10     815397739
13     22657919
19     83177779
20     82579529
22     5829949
23     35348926
25     3865978
I expected the second output, because there are lots of contract sk but there is one contract_sk in first query result. i did not get the point. What is the problem ?

user8649469 wrote:
I changed only column order in query2.So what else do you expect? If you order, for example, by last name, fist name don't you think rows will be returned in a different order (and therefore same row will have different row number) than ordering by first name, last name?
SY.

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