order by pulling on the cost of the query by 4 times

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• Need help to understand the query result

  Hi gurus

  I was reading one of the question here in this forum and its link is below:

  Query required for scenario

  I had some confusion related to this code and don't understand the logic of the out put, see query below:

  Query

  with sub_services as

  (

  Select su_seq 12323, 'HLR1' so_id, 1 seq Union double all the

  Select su_seq 12323, "HLR2' so_id, seq 2 Union double all the

  Select su_seq 12323, "A09" so_id, seq 3 of all the double union

  Select su_seq 12333, "MO1" so_id, seq 4 Union double all the

  Select su_seq 12333, "MO2' so_id, seq 5 Union double all the

  Select su_seq 12333, "A09" so_id, 6 seq in union double all the

  Select su_seq 12333, 'M0CR' so_id, seq 7 Union double all the

  Select su_seq 12999, "LOL1' so_id, seq 8 Union double all the

  Select su_seq 12999, "LOL2' so_id, seq 9 double

  )

  Select *.

  of sub_services b

  where exists (select 1 from sub_services

  where su_seq = b.su_seq

  and so_id = 'A09.

  )

  order by 2;

  The query result

  12323 A09 3

  12333 6 A09

  12323 HLR1 1

  12323 HLR2 2

  12333 M0CR 7

  12333 4 MO1

  12333 5 MO2

  According to my understanding, the above query should return records in red only because of her is below command

  It exists (select 1 from sub_services

  where su_seq = b.su_seq

  and so_id = 'A09.

  but don't know why he's back 7 files, can someone help me understand the result...

  It is query is functionally identical to the PL/SQL block, but much more effective.

  declare

  number of l_res;

  Start

  for line (select *)

  sub_services) loop

  Start

  Select 1 from l_res

  of sub_services

  where su_seq = row.su_seq and

  so_id = "A09" and

  rownum = 1;

  exception when

  NO_DATA_FOUND then

  null;

  end;

  end loop;

  end;

  Essentially every row in the outer query are tested against him exists query.  Given the correlation between two requests is based only on su_seq each line with a su_seq value returned by him is returned in the output.

  Another way to think he uses instead a join condition.  This query is equivalent to the query to exist

  Select the main

  of main sub_services

  Join select (separate su_seq

  of sub_services

  where so_id = "A09") cond

  We main.su_seq = cond.su_seq;

  John

• How to automatically add the line number in the query

  Hello
  
  Can anyone please glimpses me the path to achieve this?
  
  I want to write a query that will search the record based on the line number in the result set.
  Let's say I have 500 rows in the employee table, but I want to put a condition on request where will see record only between 100 to 200 line number in the result set.
  
  
  
  Thank you
  Madam.

  It is wrong to say that look for the lines between ROWNUM 100 to 200 unless you define a column of lines must be ordered.

  Oracle does not guarantee that the lines will be be returned in the same order if you run the query several times without defining the ORDER BY clause.

  So first decide on what columns you want to order the files and then use the rownum to assign the line number and then get the records you want.

  something like that

  SQL>SELECT *
    2    FROM ( SELECT e.*
    3                 ,ROW_NUMBER() OVER (ORDER BY sal)  row_num
    4             FROM emp  e
    5         )
    6   WHERE row_num BETWEEN 5 AND 10;
  
       EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO    ROW_NUM
  ---------- ---------- --------- ---------- --------- ---------- ---------- ---------- ----------
        7654 MARTIN     SALESMAN        7698 28-SEP-81       1250       1400         30          5
        7934 MILLER     CLERK           7782 23-JAN-82       1300                    10          6
        7844 TURNER     SALESMAN        7698 08-SEP-81       1500          0         30          7
        7499 ALLEN      SALESMAN        7698 20-FEB-81       1600        300         30          8
        7782 CLARK      MANAGER         7839 09-JUN-81       2450                    10          9
        7698 BLAKE      MANAGER         7839 01-MAY-81       2850                    30         10
  
  6 rows selected.
  
  SQL>
  

  Concerning
  Arun

• Cfquery results sorted by column being added after the query to execute

  I have a function that returns a Recordset, adds a column using QueryAddColumn goes through the recordset and rearranges the elements using QuerySetCell.
  
  Once the function is executed, the output displays the elements in their natural order and lists the new order as a table column.
  
  How I can make the equivalent of ORDER BY myNewColumn because the query has already been run.
  
  My code is attached.
  
  Thank you
  Paul
  
  

  Never mind, sussed it!

  Add the following to query of query:

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