Use of RegExp and connect by level in Oracle SQL

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  I use Windows Vista and that you need to download SQL Server 2005 Express Service Pack 4. I get an error code 64 C help, please.

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  I suggest you to try the steps below and check if it helps.

  Method 1: Try to reset components to update Windows from the following link, which would help you to install the updates of windows. http://support.Microsoft.com/kb/971058

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  http://www.Microsoft.com/download/en/details.aspx?displaylang=en&ID=184

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  Edited by: 936867 may 25, 2012 20:18

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  select 'AL' state, 12 value from dual union all
  select 'AL' state, 12 value from dual union all
  select 'AL' state, 78 value from dual union all
  select 'AL' state, 34 value from dual union all
  select 'AL' state, 4 value from dual union all
  select 'AL' state, 12 value from dual union all
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  select 'MA' state, 234 value from dual union all
  select 'MA' state, 789 value from dual union all
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                               when value between 200 and 299 then 2
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• Connect by PRIOR vrs Connect by LEVEL

  Hello

  I'm trying to understand the difference between CONNECT BY PRIOR and CONNECT BY LEVEL

  I know that CONNECT BY PRIOR is basically specifying a hierarchy and which column / field is the parent (using the PRIOR)

  for example

  SELECT employe_id, employee_name, level

  Employees

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  Q1. What is CONNECT BY LEVEL (for example as shown below) practice? What type of relationship normally described? (below, it is just producucing a series of integers)

  SELECT the level

  OF the double

  CONNECT BY LEVEL < = 10;

  T2. Use LEVEL with CONNECT BY in this way, a subversive use of the CONNECT IN knowledge is really intended to be used this way?

  any advice appreciated,

  Jim

  Hi, Jim,.

  Jimbo wrote:

  Hello

  I'm trying to understand the difference between CONNECT BY PRIOR and CONNECT BY LEVEL

  I know that CONNECT BY PRIOR is basically specifying a hierarchy and which column / field is the parent (using the PRIOR)

  for example

  SELECT employe_id, employee_name, level

  Employees

  CONNECT BY PRIOR employee_id = manager_id;

  Sometimes, CONNECT BY using hierarchical data, such as a tree.  In these cases, it may be useful to use the terns as "parent" and "child."  The query above is one of these cases.

  In more general terms, CONNECT BY returns the union (UNION ALL, specifically) of lines found by the START WITH clause (LEVEL = 1) and lines found by the clause CONNECT BY (LEVEL > 1).  If there is no START WITH clause, every row in the table will appear on LEVEL = 1.

  If there is no line on LEVEL = N, then Oracle research lines that meet the CONNECT BY clause, to search for the lines that are connected to each line level = N, for put the LEVEL N + 1.  If the CONNECT BY clause is set to TRUE for a given row, while the rank will appear on level N + 1 =.  Often (but not always) the CONNECT BY clause uses the PRIOR operator.  After PRIOR consent refers to something = N level.

  Q1. What is CONNECT BY LEVEL (for example as shown below) practice? What type of relationship normally described? (below, it is just producucing a series of integers)

  SELECT the level

  OF the double

  CONNECT BY LEVEL<>

  Since there is no START WITH clause, each line of the double table will be LEVEL = 1.

  The CONNECT BY clause means that CONNECT BY always means: If there is a line at = N, then it will be connected to any line that fills the CONNECT BY conditions.

  So that the lines will be added to the level = 2?  All the lines where condition 2<= 10="" is="" true,="" so="" every="" row="" in="" the="" dual="" table="" will="" be="" on="" level="">

  What lines will be added to the level = 3?  All the lines where condition 3<= 10="" is="" true,="" so="" every="" row="" in="" the="" dual="" table="" will="" be="" on="" level="">

  ...

  What lines will be added to the level = 10?  All the lines where the condition of 10<= 10="" is="" true,="" so="" every="" row="" in="" the="" dual="" table="" will="" be="" on="" level="10." 10="" is="" true,="" so="" every="" row="" in="" the="" dual="" table="" will="" be="" on="" level="">

  What lines will be added to the level = 11?  All the lines where condition 11<= 10="" is="" true,="" so="" no="" row="" in="" the="" dual="" table="" will="" be="" on="" level="">

  Since no rows are added to the LEVEL = 11, CONNECT BY query stop right there.

  Q2. Use LEVEL with CONNECT BY in this way, a subversive use of the CONNECT IN knowledge is really intended to be used this way?

  You can think of it as being subversive.  It was certainly not how planners and the deveopers at Oracle for CONNECT BY work in versions 2 to 8; you got an error if you tried in these versions.  It is also an exception to the rule that no line can be his own ancestor.

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  Hello
  
  In a tree structure as shown below how can I get all the child (tree) level lowest records as a - E, H, G, and D.
  A a B, C, D to level 2
  B E and F at level 3, and C G at level 3
  F a H level 4
  
  A
  | l | l | l
  B C D
  | l | l | l
  E F G
  | l
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  I have used start with and coonect by to give all levels of the tree as follows: -.
  SELECT task_id, parent_task_id, top_task_id, level
  OF pa_tasks
  WHERE project =: p
  START WITH parent_task_id IS NULL
  CONNECT BY PRIOR task_id = parent_task_id
  
  Thank you
  
  Published by: user10648285 on October 17, 2011 23:42
  
  Published by: user10648285 on October 17, 2011 23:42
  
  Published by: user10648285 on October 17, 2011 23:42
  
  Published by: user10648285 on October 17, 2011 23:43

  Oracle a [url http://download.oracle.com/docs/cd/E11882_01/server.112/e26088/pseudocolumns001.htm#i1009313] nickname for hierarchical queries:

  SELECT task_id,parent_task_id, top_task_id,level
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  Hello:
  
  PROBLEM:
  ...
  ), (select rownum number months of double connect by level < = Cnt)
  
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  Thank you, Sidney
  
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  10 S 1 M 6/1/2007 11/30/2008 18 12 6/1/2007
  10 S 1 M 6/1/2007 11/30/2008 18 12 7/1/2007
  10 S 1 M 6/1/2007 11/30/2008 18 12 8/1/2007
  10 S 1 M 6/1/2007 11/30/2008 18 12 9/1/2007
  ...
  10 S 2 M 30/11/2008-9/30/2009 10 12 11/30/2008
  10 S 2 M 30/11/2008-9/30/2009 10 12 12/30/2008
  ...
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  Select x.*,
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  When FilingFrequency = 'Q' then Ceil (Months_Between(StopDate,StartDate)/3)
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  end) NTC,
  (case when FilingFrequency = am' then 1)
  When FilingFrequency = 'Q' then 3
  When FilingFrequency = 'A' then 12
  end) frequency
  de)
  ... a code complex to calculate values of start and stop dates required above...
  ) x
  ), (select rownum number months of double connect by level < = Cnt)
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  WORK WITH THE HELP OF A CONSTANT, BUT MUST HAVE THE VALUE OF THE ACTUAL CNT
  ... Same code for generating data...
  ), (select rownum number months of double connect by level < = 3)
  
  How can I get it works using the "CNT" value instead of a constant?

  A technique like this should solve your problem.

  TUBBY_TUBBZ?with data (col1, cnt) as
    2  (
    3    select 1, 3 from dual
    4      union all
    5    select 2, 2 from dual
    6  )
    7  select
    8    d.col1,
    9    t.column_value
   10  from
   11    data  d,
   12    table(cast(multiset(select level from dual connect by level <= d.cnt) as sys.OdciNumberList)) t;
  
                COL1       COLUMN_VALUE
  ------------------ ------------------
                   1                  1
                   1                  2
                   1                  3
                   2                  1
                   2                  2
  
  5 rows selected.
  
  Elapsed: 00:00:00.00
  TUBBY_TUBBZ?
  

  Contrary to what you have now, which is basically this

  TUBBY_TUBBZ?with data (col1, cnt) as
    2  (
    3    select 1, 3 from dual
    4      union all
    5    select 2, 2 from dual
    6  )
    7  select
    8    d.col1,
    9    level
   10  from
   11    data  d
   12  connect by level <= d.cnt;
  
                COL1              LEVEL
  ------------------ ------------------
                   1                  1
                   1                  2
                   1                  3
                   2                  2
                   1                  3
                   2                  1
                   1                  2
                   1                  3
                   2                  2
                   1                  3
  
  10 rows selected.
  
  Elapsed: 00:00:00.00
  TUBBY_TUBBZ?
  

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