Offset and IGNORE NULLS for LEAD/LAG

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• Lag() ignore null values performance

  Hello

  I have looked around, but didn't find everybody talks about performance problems specifically with the use of 'IGNORE NULLS' inside of an analytic function of LAG() in a view online.

  This is a cut from the version of my sql, isolated to the question under discussion.

  select * from (
    SELECT /* use_nl (j,gjt,jt) */
       jt.id
      ,COALESCE
        (lag(jt.my_column ignore nulls /* this is the nasty critter */
          ) over (order by jt.order_seq)
        ,0
        )+1 AS start_days
      ,coalesce
        (jt.my_column
        ,last_value(jt.my_column ignore nulls
          ) over (order by jt.order_seq desc)
        ) AS end_days
    FROM  a,bunch,of,tables
    WHERE ...
    ) jt 
  where jt.id = '123456'
  

  If I remove ignores NULL values in the offset, there is no performance problem.

  Last_value() is not affected.

  If I do not use a view inline then performance is very good, although it is no different to explain the plan.

  select ..
  from ...
  where ...
  and id = '123456'
  

  Has anyone come across something like this, or have any suggestions?

  Happy to try to build a test scenario if it contributes to the discussion, but I thought I would just ask the question first.

  Scott

  Scott.Wesley wrote:

  Hello

  I have looked around, but didn't find everybody talks about performance problems specifically with the use of 'IGNORE NULLS' inside of an analytic function of LAG() in a view online.

  If I remove ignores NULL values in the offset, there is no performance problem.

  Last_value() is not affected.

  If I do not use a view inline then performance is very good, although it is no different to explain the plan.

  1. Select...
  2. Of...
  3. where the...
  4. and id = '123456'

  Scott,

  He would not have anything to do with your real problem, since you say that you get different performances during the removal of the IGNORE NULLS clause, but I doubt that you get exactly the same execution plan when online display is deleted these two queries are typically semantically the same.

  If you use the inline view, Oracle cannot push the filter on the ID in the view if the analytical functions partitions not by this ID, because the result will not be the same for the steps: with the online mode, the data is transformed without filtering for the evaluation of the expressions of the LAG etc, and then the filter is applied.

  If you remove the inline view and filter directly, it has a quite different meaning because now the data will be filtered first and then the analytical functions apply to the filtered result set.

  So the case of inline view maybe has to deal with a completely different volume (larger) identical to the variant of view data not online according to the selectivity of the filter - which could explain that the clause "IGNORE NULLS" made a significant difference in performance on this larger volume of data to deal with, but not necessarily.

  Randolf

• Function of lag ignoring NULL values in 10g

  I have the following query that works well in 11g. I want to rewrite the query in 10g and get the same set of results. Because the offset ignoring NULL values, I used below is a new feature in 11g, someone can help me in rewriting the query below.

  Prop1 - String, evar11 - String

  Select prop1, evar11,.

  	lag (Prop1 ignores Nulls) over (partition by order of period_key of visit_page_num, visit_num, visid_low, visid_high) as prop1_lag
  	from TABLE_A

  where period_key = '20131012' - DATE

  order of visit_page_num

  Thanks in advance,

  H.

  Hello

  In Oracle 10, you can use LAST_VALUE... ROWS BETWEEN UNBOUNDED PRECEDING AND 1 PREVIOUS instead of LAG.

  As I don't have your table, I'll use scott.emp to illustrate:

  SELECT hiredate, ename, comm

  MOST LAG (comm IGNORE NULLS) (ORDER BY hiredate, ename) AS lag_comm

  , LAST_VALUE (comm IGNORE NULLS) OVER (ORDER BY hiredate, ename)

  ROWS BETWEEN UNBOUNDED PRECEDING

  AND 1 PRECEDING

  ) AS last_value_comm

  FROM scott.emp

  ORDER BY hiredate, ename

  ;

  The output shows that LAG and LAST_VALUE produce the same results:

  HIREDATE ENAME LAG_COMM LAST_VALUE_COMM COMM

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

  DECEMBER 17, 80 SMITH

  FEBRUARY 20, 81 300 ALLEN

  FEBRUARY 22, 81 WARD 500 300 300

  2 APRIL 81 JONES 500 500

  MAY 1, 81 BLAKE 500 500

  JUNE 9, 81 CLARK 500 500

  08 SEP-81 TURNER 0 500 500

  28 SEP-81 MARTIN 1400 0 0

  NOVEMBER 17, 81 1400 1400 KING

  DECEMBER 3, 81 1400 1400 FORD

  DECEMBER 3, 81 JAMES 1400 1400

  JANUARY 23, 82 1400 1400 MILLER

  APRIL 19, 87 SCOTT 1400 1400

  MAY 23, 87 1400 1400 ADAMS

  To run the Oracle 11.1 or earlier, comment out the call to the LAG.

• Sorting and null for currency values in a report

  All,
  I think this should be easy, and I just missed something obvious.
  I have an APEX 3.2.1 standard report that includes a column with a monetary value in it. I want the column to display the UK pound sign to be able to sort and display NULL values, as appropriate.
  The question I have is that I can't find a way to reach all 3 in a medium satisfctory. As I see the options would be:
  
  (1) in the SQL for the report, concat the pound sign in the required column, for example SELECT "£". amount OF the...
  The problem is that it makes this field a CHAR field, so sorting is not sort of the same way as for a numeric field.
  
  (2) use the format FML999 number... etc in the column attribute.
  The problem with this is that it is a multi-country database, and the default currency unit is the value of the U.S. dollar.
  
  (3) expression box to use HTML code in the column attribute to display £#COL #.
  It fills the pound sign and keep the number format, but unfortunately a null value is displayed as a sign of pounds with no number. I do not see how so he can leave this value in the report as completely empty.
  
  As I said, I'm sure I missed obvious soemthing. If someone can identify how to achieve this it would be much appreciated.
  
  Kind regards
  Jon.

  >
  (2) use the format FML999 number... etc in the column attribute.
  The problem with this is that it is a multi-country database, and the default currency unit is the value of the U.S. dollar.
  >

  The NLS currency symbol can be changed on the fly if you have a few ways to identify the location/preference of the user: {: identifier of the thread = 990848} (ignore the last post)

  However, it probably doesn't make sense to do - ≠ £100 $100 (at least I hope not!) - unless there is some sort of conversion occurring in the report? Is there a currency stored and the amount?
  >
  (3) expression box to use HTML code in the column attribute to display £#COL #.
  It fills the pound sign and keep the number format, but unfortunately a null value is displayed as a sign of pounds with no number. I do not see how so he can leave this value in the report as completely empty.
  >
  Use 2 columns, one for the amount and one for the money, with a switch to include or exclude it if necessary:

  select
            ename
          , comm amount
          , nvl2(comm, '£', null) currency
  from
            emp
  where
            job in ('SALESMAN', 'MANAGER')
  
  ENAME      AMOUNT                 CURRENCY
  ---------- ---------------------- --------------------------------
  ALLEN      300                    £
  WARD       500                    £
  JONES
  MARTIN     1400                   £
  BLAKE
  CLARK
  TURNER     0                      £                                
  

  Then use the two columns in the Expression of the amount of HTML:

  #CURRENCY##AMOUNT#
  

• Apple Software update for windows stop working after 2.2? updated in date dated March 10,2016. Do not install! I had to reinstall and ignore the update to get it working again

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• Problems with Last_value (col Ignore Nulls)

  Thank you in advance
  
  I use Last_value (col Ignore Nulls) in Expression
  
  LAST_VALUE (INGRP1. AADT IGNORE NULLS) (ORDER OF INGRP1. ROUTE_ID, INGRP1. COUNTY, INGRP1.CO_ORDR, INGRP1. BEG_MP)
  
  I am getting error can of assistance
  
  

  Line 2, Col 30:
  PLS-00103: Encountered the symbol "IGNORE" when expecting one of the following:
  
     . ( ) , * @ % & | = - + < / > at in is mod remainder not
     range rem => .. <an exponent (**)> <> or != or ~= >= <= <>
     and or like LIKE2_ LIKE4_ LIKEC_ as between from using ||
     multiset member SUBMULTISET_

  Hello

  Change the code Generation Mode 'Base set' and the run setting default operating Mode "base set" and redeployment.

  Default OWB will generate code with a bunch of different modes including PLSQL focused on the line. You use SQL based unparalleled PLSQL so get a problem compiling for the line section based on the generated code.

  See you soon
  Davivd

• JDev 11 g: problem view VO criteria ignore Null values

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  I don't know if it's a bug or do something wrong but here is my case:
  I created an original Version of a database table.
  In page view of all of VO, aaa I bind a variable named
  Then I add a criteria-> display I add an element of criteria including bing my previously create variable to an attribute of VO-> I have defined validation on "necessary".
  Then a race my request and made a few test/dev.
  
  After a while, I needed to change my display criteria 'optional' with 'Ignore Null values' checked.
  I changedit, run my application and the display criteria did not work... I don't add no rows returned when I went to my variable named "null".
  After 1 or 2 days to research, I managed to notice that in fact, an attribute is missing in my VO object source.
  
  I needed to add explicitly in the XML of the source of this attribute:
  GenerateIsNullClauseForBindVars = 'true '.
  
  in the desired so ViewCriteriaItem it ignores Null values.
  
  I tried various combinations of the interface for presentation but non of them generated this attribute set to "true".
  Only when I put the validation 'Optional' and ' ignore values null ' unchecked, GenerateIsNullClauseForBindVars = 'false' appears in the XML source code.
  
  Is this a bug?
  Here's my version JDev: Build JDEVADF_11.1.1.1.0_GENERIC_090615.0017.5407
  
  Jack

  To report a bug, you must go through the MOS (aka Metalink). You need a support contract valid to log into MOS.

  Timo

• Tuner Radio and Qosmio F30 for WMC

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• How to use offset and multiplier in waveform graph?

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• Trying to remove the folders from Windows one system empty, but in error "is a Windows system folder and is required for Windows work.» It cannot be deleted. »

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  http://www.eset.com/us/online-scanner
  http://www.Microsoft.com/security/scanner/en-us/default.aspx (requires download)
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• Null implicit and explicit null

  Hi experts,

  I met two terms which is null implicit and explicit null and I were confused.

  anyone can try to explain what that means exactly by both of these terms.

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  Mahesh

  Hello

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• java.io.IOException: null for setRequestMethod ("POST") of HttpConnection

  Hello

  I m opening HttpConnection with

  HttpConnection connection = null;
  
  try
  {
      connection = (HttpConnection)Connector.open(targetURL);
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  But I m is

  java.io.IOException: null for setRequestMethod("POST")
  

  Until it runs fine.

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• Can check and not Null added to the names Administration constraints?

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  I logged an ER

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• NULL for repeated records

  Hi team,

  According to the sub query Deptno column is repeated results must show that it is null

  my output should be

      DEPTNO ENAME             SAL         RN        RNK       DRNK
  ---------- ---------- ---------- ---------- ---------- ----------
          10 KING             5000          1          1          1 
              CLARK            2450          2          2          2 
              MILLER           1300          3          3          3 
          20 SCOTT            3000          1          1          1 
              FORD             3000          2          1          1 
             JONES            2975          3          3          2 
          30 BLAKE            2850          1          1          1 
              ALLEN            1600          2          2          2 
              TURNER           1500          3          3          3 
             MARTIN           1250          4          4          4 
             WARD             1250          5          4          4 
             JAMES             950          6          6          5 
  

  14 selected lines

  select deptno
    , ename,sal,
       row_number()
         over (partition by deptno
               order by sal desc)rn,
       rank()
         over (partition by deptno
               order by sal desc)rnk,
       dense_rank()
         over (partition by deptno
              order by sal desc)drnk
      from emp
     order by deptno, sal desc
     /
     DEPTNO ENAME             SAL         RN        RNK       DRNK
  ---------- ---------- ---------- ---------- ---------- ----------
          10 KING             5000          1          1          1 
          10 CLARK            2450          2          2          2 
          10 MILLER           1300          3          3          3 
          20 SCOTT            3000          1          1          1 
          20 FORD             3000          2          1          1 
          20 JONES            2975          3          3          2 
          20 ADAMS            1100          4          4          3 
          20 SMITH             800          5          5          4 
          30 BLAKE            2850          1          1          1 
          30 ALLEN            1600          2          2          2 
          30 TURNER           1500          3          3          3 
          30 MARTIN           1250          4          4          4 
          30 WARD             1250          5          4          4 
          30 JAMES             950          6          6          5 
  
  
   14 rows selected 
  

  Hello

  If you need to do this in SQL, and then use an expression BOX to return deptno for the first line of each deptno and NULL for all others.  ROW_NUMBER can determine which is the first line, like this:

  Select

  CASE

  WHEN ROW_NUMBER () OVER (PARTITION BY deptno

  Sal of ORDER BY DESC

  )  = 1

  THEN deptno

  ANOTHER NULL - Default; can be omitted

  END AS deptno

  ename, sal,

  ROW_NUMBER()

  courses (deptno partition

  order by sal desc) rn,.

  Rank()

  courses (deptno partition

  order by sal desc) rnk.

  DENSE_RANK()

  courses (deptno partition

  order by sal desc) drnk

  from scott.emp

  order by EMP. DeptNo, sal desc

  /

  Notice how I used emp.deptno in the ORDER byclause in the query.  Simply deptno in this place means that the results of the CASE, not the original column expression.

• Adobe first Elements 13 do not interpret the film and properties correctly for widescreen is a mod.

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  fran3

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  https://www.Adobe.com/cfusion/mmForm/index.cfm?name=wishform