Order by missing pls help

Question

Hi,
first one is old query ,I re write this query as second query with using WITH clause,Both are returning same rows but Oder is missing,
Java developers need same order.Could you pls help to get same order for second query as 1st query .And i tried Order by clause for second query all possibilities but i did't get same order as 1st.
*1st query*
SELECT   a.test_session_id, c.roster_domain_name, a.sem
  FROM   test_session_detail a, test_session b, test_detail c
WHERE   a.test_session_id = b.test_session_id
         AND c.test_detail_id = a.test_detail_id
         AND EXISTS
               (SELECT   td.test_detail_id
                  FROM   test_detail td
                 WHERE       domain_map_id IS NOT NULL
                         AND c.test_detail_id = td.test_detail_id
                         AND domain_map_id IN ('303', '306', '305', '304'))
         AND b.test_session_id IN ('4047','4086','4087','4165','4167','4169')
AND domain_group_id NOT IN
                  (SELECT   domain_group_id
                     FROM   test_session_detail a, test_session b
                    WHERE       a.test_session_id = b.test_session_id
                            AND a.domain_group_id IS NOT NULL
                            AND b.test_session_status_id = 4
                            AND a.test_session_status_id <> 3
                            AND b.test_session_id IN
                                     ('4047','4086','4087','4165','4167','4169'))     
sample output of 1st query
TEST_SESSION_ID     ROSTER_DOMAIN_NAME     SEM
4047     AR - Integers and Fractions     2
4047     AR - Integers and Fractions     2
4047     AR - Decimal Numbers     1
4047     AR - Decimal Numbers     1
4047     AR - Percent     1
4047     AR - Percent     1.52
4047     AR - Estim, Ordering, Numb. Sense     11.34
4047     AR - Estim, Ordering, Numb. Sense     11.34
4047     AR - Word Problems     0.401
4047     AR - Word Problems     1
4086     AR - Integers and Fractions     1.5
4086     AR - Decimal Numbers     1.342
4086     AR - Percent     1
4086     AR - Estim, Ordering, Numb. Sense     11.34
4086     AR - Word Problems     2second query
WITH exist_1 AS
               (SELECT   td.test_detail_id
                  FROM   test_detail td
                 WHERE       domain_map_id IS NOT NULL
               AND domain_map_id IN ('303', '306', '305', '304')),
domain_group AS
                  (SELECT   domain_group_id
                     FROM   test_session_detail a, test_session b
                    WHERE       a.test_session_id = b.test_session_id
                            AND a.domain_group_id IS NOT NULL
                            AND b.test_session_status_id = 4
                            AND a.test_session_status_id <> 3
                            AND b.test_session_id IN
                                     ('4047','4086','4087','4165','4167','4169'))
SELECT   a.test_session_id, c.roster_domain_name, a.sem
  FROM   test_session_detail a, test_session b, test_detail c,exist_1 ex, domain_group dg
WHERE   a.test_session_id = b.test_session_id
         AND c.test_detail_id = a.test_detail_id
         AND dg.domain_group_id(+) =A.DOMAIN_GROUP_ID
         AND dg.domain_group_id IS NULL
         AND ex.test_detail_id = c.test_detail_id
         AND b.test_session_id IN ('4047','4086','4087','4165','4167','4169')                                    
sample output of second query
TEST_SESSION_ID     ROSTER_DOMAIN_NAME     SEM
4086     AR - Word Problems     2
4086     AR - Estim, Ordering, Numb. Sense     11.34
4086     AR - Percent     1
4086     AR - Decimal Numbers     1.342
4086     AR - Integers and Fractions     1.5
4047     AR - Word Problems     0.401
4047     AR - Estim, Ordering, Numb. Sense     11.34
4047     AR - Percent     1.52
4047     AR - Decimal Numbers     1
4047     AR - Integers and Fractions     2
4047     AR - Word Problems     1
4047     AR - Estim, Ordering, Numb. Sense     11.34
4047     AR - Percent     1
4047     AR - Decimal Numbers     1
4047     AR - Integers and Fractions     2

Answer 1

Hi,
user575115 wrote:
Hi,
Even if i give order by a.test_session_id in both queries not ordering properly in second query as 1st query.When you say
ORDER BY  a.test_session_id    DESCin your main query, then you can be sure that all the rows where a.test_session_id=4086 will be together, before any rows with a.test_session_id=4047. But if you have 5 rows where a.test_session_id=4086, there is no telling what order those 5 rows will be in, and it will not necessarily be the same every time you run the exact same query with the exact same data. You can ORDER BY additional columns or expressions, even columns or expressions that are not in the SELECT clause.
For example, if you say:ORDER BY  a.test_session_id    DESC
,         a.test_detail_idthen you can be sure the rows where a.test_session_id=4086 will be together, before any rows with a.test_session_id=4047, as before, but you can also be sure that the rows where a.test_session_id=4086 will be in order by a.test_detail_id. If that is not unique, keep adding more columns.
If the ORDER BY clause includes the primary key (or any unique key) from each table, then you can be sure that the results will always be in the same order.