the LAST_VALUE function and forecasts

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• I use the random function and he know instructions 'case' must end with a ':' but it is!

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• Any difference between the separate function and aggregation in sql query cost?

  Hello
  I've run many models sql stmts - such as:
  one) using a single table
  (b) using the two tables, using simple joins or outer joins
  
  but I didn't notice a difference in sql stmts in cost and implementation plan...
  In any case, my colleague insists on only using the aggregate function is less expensive compared to
  separate... (something I've not confirmed, that is why I believe that they are exactly the same...)
  
  For the situation described above under 1 sql... We could for example use
  

  select distinct deptno
  
   from emp

  select count(*), deptno
  
   from emp
  
   group by deptno

  select distinct owner, object_type from all_objects

  select count(*), owner, object_type from all_objects
  
  group by owner, object_type

  Have you ever found no difference between the two...?
  
  Note: I use Ora DB 10g v2.
  
  Thank you
  SIM

  Alexandre Gelin says:
  function separate and aggregation are for different uses and can give the same result, but if you use the aggregate function to get the separate records, it will be expensive...

  really? I find them almost identical to 11g. Actually GROUP BY is almost always more fast for me in the old days.

  article about this askTom Re: any difference between the separate function and aggregation in sql query cost?
  This applies mainly to the older oracle versions http://www.oracle.com/technology/products/rdb/pdf/distinct_derivedtables_groupby_sort_tech_article.pdf

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• Bug with the aggregate function and no group

  When I run the following query:

  with the_table as
  (
    select 1 as id, 100 as cost from dual
    union all select 2 as id, 200 as cost from dual
    union all select 3 as id, 300 as cost from dual
    union all select 4 as id, 400 as cost from dual
    union all select 5 as id, 500 as cost from dual
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  (
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    from the_table
    --
    union all
    --
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    from the_table
    where 0 = 1
    -- group by 1
  )
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  I get this result:

  ID    COST
  --  ------
   0  <null>     
   1     100
   2     200
   3     300
   4     400
   5     500

  However, when I "uncomment" the line "Group 1", the query works as expected (without the id = rank 0).
  
  This occurs even when "the_table" is an array.
  
  Someone else comes through this (and if so, how long is a problem)?
  
  The database is 11.2.0.2.0 64-bit.
  
  EDIT: It also happens without a Union - the following returns a single line (with null 0 and cost of id) without the Group By and no line with her:

  select id, cost
  from
  (
    select 0 as id, sum(cost) as cost
    from 
    (
      select 1 as id, 100 as cost from dual
      union all select 2 as id, 200 as cost from dual
      union all select 3 as id, 300 as cost from dual
      union all select 4 as id, 400 as cost from dual
      union all select 5 as id, 500 as cost from dual
    )
    where 0 = 1
    -- group by 1
  )
  order by id

  Edited by: Donbot February 15, 2012 10:29

  Donbot wrote:
  Someone else comes through this (and if so, how long is a problem)?

  The database is 11.2.0.2.0 64-bit.

  This is a documented behavior.

  http://docs.Oracle.com/CD/E11882_01/server.112/e26088/functions003.htm#SQLRF20035

  "
  All except COUNT (*) GROUPING and GROUPING_ID aggregate functions ignore NULL values. You can use the NVL function in the argument of an aggregation function to substitute a value for a null value. COUNTY and REGR_COUNT never return null, but return a number or zero. For all remaining functions of aggregation, * if the DataSet contains no line, * or if it contains only the rows with NULL values as arguments to the aggregate function, * then the function returns null.*
  "

• limit the number of values in the listagg function and create several games

  Hi all
  
  I have a requirement where I would like to group one of the fields in a field based on the number of records. Lets say if we have an employee with multiple CODEZONE. Please see the example below. I want concatenation of each 10 EMPNO records into one. If she has more than 10 records for a given EMPNO, it should show in the form of another record.
  For example:
  EMPNO CODEZONE
  A111 AL
  A111 AK
  A111 AZ
  A111 AR
  A111 CA
  A111 CO
  A111 CT
  TO A111
  A111 DC
  A111 FL
  A111 GA
  A111 HI
  B222 AL
  B222 AK
  B222 AZ
  B222 AI
  B222 KS
  B222 KY
  THE B222
  B222 ME
  B222 MD
  MY B222
  B222 MI
  B222 CA
  B222 CO
  B222 CT
  B222 OF
  
  Result set:
  EMPNO CODEZONE
  A111 AL | AK | AZ | AR | CA | CO | CT | OF | DC | FL
  A111 GA | HI
  B222 AL | AK | AZ | AI | KS |     KY | THE | ME | MD | MY
  B222 MI | CA | CO | CT | OF
  
  The above example can have any number of area CODE for a given EMPNO, the end result should show only a maximum of 10 codes for an EMPNO in each record. If she has more than 10 CODEZONE, it should show as another record. Please provide me with a generic statement to solve this problem. I was not able to control by setting the limit on records for an EMPNO gave to the LISTAGG function. Any ideas are much appreciated.
  
  Thank you

  1008754 wrote:
  Hi all

  I have a requirement where I would like to group one of the fields in a field based on the number of records. Lets say if we have an employee with multiple CODEZONE. Please see the example below. I want concatenation of each 10 EMPNO records into one. If she has more than 10 records for a given EMPNO, it should show in the form of another record.
  For example:
  EMPNO CODEZONE
  A111 AL
  A111 AK
  A111 AZ
  A111 AR
  A111 CA
  A111 CO
  A111 CT
  TO A111
  A111 DC
  A111 FL
  A111 GA
  A111 HI
  B222 AL
  B222 AK
  B222 AZ
  B222 AI
  B222 KS
  B222 KY
  THE B222
  B222 ME
  B222 MD
  MY B222
  B222 MI
  B222 CA
  B222 CO
  B222 CT
  B222 OF

  Result set:
  EMPNO CODEZONE
  A111 AL | AK | AZ | AR | CA | CO | CT | OF | DC | FL
  A111 GA | HI
  B222 AL | AK | AZ | AI | KS |     KY | THE | ME | MD | MY
  B222 MI | CA | CO | CT | OF

  The above example can have any number of area CODE for a given EMPNO, the end result should show only a maximum of 10 codes for an EMPNO in each record. If she has more than 10 CODEZONE, it should show as another record. Please provide me with a generic statement to solve this problem. I was not able to control by setting the limit on records for an EMPNO gave to the LISTAGG function. Any ideas are much appreciated.

  Thank you

  ME_XE?with data (empno, areacode) as
    2  (
    3     select 'A111', 'AL' from dual union all
    4     select 'A111', 'AK' from dual union all
    5     select 'A111', 'AZ' from dual union all
    6     select 'A111', 'AR' from dual union all
    7     select 'A111', 'CA' from dual union all
    8     select 'A111', 'CO' from dual union all
    9     select 'A111', 'CT' from dual union all
   10     select 'A111', 'DE' from dual union all
   11     select 'A111', 'DC' from dual union all
   12     select 'A111', 'FL' from dual union all
   13     select 'A111', 'GA' from dual union all
   14     select 'A111', 'HI' from dual union all
   15     select 'B222', 'AL' from dual union all
   16     select 'B222', 'AK' from dual union all
   17     select 'B222', 'AZ' from dual union all
   18     select 'B222', 'IA' from dual union all
   19     select 'B222', 'KS' from dual union all
   20     select 'B222', 'KY' from dual union all
   21     select 'B222', 'LA' from dual union all
   22     select 'B222', 'ME' from dual union all
   23     select 'B222', 'MD' from dual union all
   24     select 'B222', 'MA' from dual union all
   25     select 'B222', 'MI' from dual union all
   26     select 'B222', 'CA' from dual union all
   27     select 'B222', 'CO' from dual union all
   28     select 'B222', 'CT' from dual union all
   29     select 'B222', 'DE' from dual
   30  )
   31  select
   32     empno, listagg(areacode, ',') within group (order by emp_grp)   as emp_list
   33  from
   34  (
   35     select
   36             ceil(row_number() over (partition by empno order by areacode) / 10) as emp_grp,
   37             empno,
   38             areacode
   39     from data
   40  )
   41  group by empno, emp_grp;
  
  EMPNO                          EMP_LIST
  ------------------------------ ------------------------------
  A111                           AK,AL,AR,AZ,CA,CO,CT,DC,DE,FL
  A111                           GA,HI
  B222                           AK,AL,AZ,CA,CO,CT,DE,IA,KS,KY
  B222                           LA,MA,MD,ME,MI
  
  4 rows selected.
  
  Elapsed: 00:00:00.05
  ME_XE?
  

  In the future, it would be nice if you could provide baseline data.

  See you soon,.

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• The ABS function and the sum at a time

  <? If: sum (ARCH_AMT)! = '0' ? >
  
  We used above condition in the model to restrict the data to date, but we were faced with a new problem when ARCH_AMT is to have several lines with the same amount but + ve and ve - that is to say 500, -500, is the sum and do not return data given that the sum would be zero.
  
  We do ABS (ARCH_AMT) before making the sum that the SUM will be thousand and data will be collected.
  
  Please suggest how can we have ABS and the sum at a time
  
  I tried
  
  <? If: sum (ABS (ARCH_AMT))! = '0' ? > and also choose the conditions and it does not work.
  
  Thanks in advance.
  
  Kind regards
  Mahi
  
  Published by: mahi4luck on March 28, 2012 02:33

  store ABS (ARCH_AMT) in a variable and use this variable in a total cumulative

  example:
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  -500
  
  
  500
  
  

  
  

  
  
  
  

  Total:

• I used the inverse function for a palindrome bulk pl/Sql program, but it is said to declare the inverse function and my code is below! Please suggest me some friends of ideas and thanks in advance

  declare

  i_var varchar2 (30): = '& enter_string';

  Vout varchar2 (20);

  Start

  :=Lower(Reverse(i_var)) Vout;

  If lower (i_var) = vout can

  dbms_output.put_line ('this is a palindrome');

  on the other

  dbms_output.put_line ('this is not a palindrome');

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  SQL > declare

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  3 vout varchar2 (20);

  4 start

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  7 double;

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  9. can

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  11 other

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  15.

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  Bolton is not a palindrome

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• analytical function and the aggregate function

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  Hello

  Analytic Functions : -.

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  Analytical functions are commonly used to calculate cumulative aggregates, moving, centered and considered.

  Aggregate functions : -.

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  Published by: varun4dba on January 27, 2011 15:32

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