How to find the second largest in a pl/sql table

Similar Questions

• How to find the name of a column in a table

  Hi all
  
  I have a Table that contains approximately 100 columns.
  
  
  I need to find the column name, to find in specific columns containing data like 'abc '.
  
  Ex: I have a table like temp_table_name
  the columns are col1, col2, col3, col4, col5, col6, col7, col8,.... col99
  I'm looking for with data specific like 'abc '.
  
  Need to find the name of the table column that contains data of 'abc '.
  
  Please suggest me. How to find in a single query... :-)
  
  Actually I'm looking through a column of the table as below
  Select count (*) in the temp_table_name where col1 = 'abc '.
  
  FOR I IN 1.20 LOOP
  ln_num_of_rows: = 0;
  lv_column_name_search: = "col" | I have;
  
  lv_sql: = ' select count (*) in the temp_table_name where ' | lv_column_name_search | "= abc";
  
  EXECUTE IMMEDIATE lv_sql INTO ln_num_of_rows;
  
  IF ln_num_of_rows > 0
  -column found in lv_column_name_search
  EXIT;
  END IF;
  END LOOP;
  
  But I'm gettig performance problem.
  
  How can I do this in any other alternative way? could you suggest any way possible as soon as POSSIBLE.

  It's probably never going to be effective - realistic, you have to scan completes the picture.

  You could probably improve a little things by doing something like

  SELECT DISTINCT column_name
    FROM (
      SELECT (CASE WHEN col1 = 'abc' THEN 'col1'
                  WHEN col2 = 'abc' THEN 'col2'
                  WHEN col3 = 'abc' THEN 'col3'
                  ...
                  WHEN col20 = 'abc' THEN 'col20'
                  ELSE NULL
                  END) column_name
        FROM table_name
      WHERE col1 = 'abc'
          OR col2 = 'abc'
          ...
          OR col20 = 'abc'
    )
  

  but it's never going to be incredibly fast.

  Justin

• How to create the constructor function for a pl/sql table?

  I created a PL/SQL type as table below:

  create or replace type typ_tbl_des_text is table of the typ_tof_des_text

  OK so far, but I would like to have a constructor function which would be subject to validations and raise_application_error when a validation condition is not met.

  How to do this?

  The typ_tof_des_text that I created with a constructor function, so that the record-level validation are performed in the constructor. And I think the postings between several records shall be made in a constructor for typ_tbl_des_tex, but cannot figure out how to create such a constructor.

  BEDE wrote:

  So, if I have understood correctly, to a plsql table type, I can't have a member procedure. Or can I? I mean, just as for a type of failure I can have one or more constructors and possibly several procedures of Member.

  For the standard tables in PL/SQL, you will need to create your own API (using procedures and functions) to handle beyond the basics provided by the language. No constructors and methods as it is no o - o.

  After thinking a little deeper, I reformulate what I said earlier and actually wants to have a member procedure called add_item, who would be first to check if an item with a key value exists and, if so, it would be up-to-date and so not only extend the plsql table.

  Two options.

  As we already mentioned, an associative array can be considered - note however that this structure of table has name-value pairs.

  Another method is to use a TWG (global temporary table). You define the structure of the once initial table. When a session uses the structure of the table, private copying is instantiated for this session. When the session ends, this copy is destroyed. The table is a temporary structure for this session only.

  It can include indexes and so on – which means you can use the constraints of primary keys, unique indexes, secondary indexes and so on.

  TWG scales are much better than collections or arrays that require a PGA (expensive private server) memory. In addition, SQL can be used natively against a GTT - unlike the arrays and collections.

• How to find the largest

  DECLARE

  Num_tab_ty TYPE TABLE IS NUMBER;

  num_tab num_tab_ty: = num_tab_ty (6,4,8,7);

  BEGIN

  -How to find the largest and the lowest number in a collection

  END;

  DECLARE

  Num_tab_ty TYPE TABLE IS NUMBER;

  num_tab num_tab_ty: = num_tab_ty (6,4,8,7);

  number of l_greatest_value;

  BEGIN

  Select max (column_value)

  in l_greatest_value

  table (num_tab);

  END;

  /

  HTH

• How to find the first Sunday and the second Saturday of each month

  Hi all

  How to find the first Sunday and the second Saturday of each month

  Thank you

  Oracle Database 11 g Enterprise Edition Release 11.1.0.7.0 - 64 bit Production

  994122 wrote:

  Hello

  I need to pass the months parameter how to do this? like Jan, Feb etc... (one of those)

  Do you have a procedure?

  Should you output only for the months you passed in the parameter?

  The easiest way is to set the parameter as date. When you go such as p_date as DATE ' 2014-10-01', then you can

  PROCEDURE two_dates)

  p_date IN DATE

  p_first_sunday DATE

  p_second_saturday DATE

  )

  IS

  BEGIN

  p_first_sunday: = NEXT_DAY (TRUNC (p_date, 'MM') - 1, TO_CHAR (DATE ' 2014-10-12', 'DAY'));

  p_second_saturday: = NEXT_DAY (TRUNC (p_date, 'MM') - 1, TO_CHAR (DATE ' 2014-10-11', 'DAY')) + 7;

  END two_dates;

  Or you describe what you need.

• Equium M50 - cannot find the second memory location

  I just bought 2 X 1 GB memory sticks to upgrade my laptop. I skipped one at the back of the machine and it works fine but I can't find the second memory location. I have to open the machine? And if so, how.

  Any help appreciated...

  Hello

  Second memory slot is not so easy to find because you have to remove the keyboard and the top cover. Please contact your dealer and ask him for help. Please do not try to do anything only because you can cancel the warranty.

• How to find the number of data items in a file written with the ArryToFile function?

  I wrote a table of number in 2 groups of columns in a file using LabWindows/CVI ArrayToFile... Now, if I want to read the file with the FileToArray function so how do I know the number of items in the file. during the time of writing, I know how many elements array to write. But assume that I want the file to be read at a later time, then how to find the number of items in the file, so that I can read the exact number and present it. Thank you all

  Hello

  I start with the second question:

  bytes_read = ReadLine (file_handle, line_buffer, maximum_bytes);

  the second argument is the buffer to store the characters read, so it's an array of characters; It must be large enough to hold maximum_bytes the value NULL, if char [maximum_butes + 1]

  So, obviously the number of lines in your text tiles can be determined in a loop:

  Open the file

  lines = 0;

  While (ReadLine () > 0)

  {

  lines ++;

  }

  Close the file

• How to get the second clue high table max and min

  Hello

  I need help to find the second clue to the data table, how can I do?

  Secure with the extract of vi.

  Thank you and best regards,

  Simon

  You forgot to make the comparison to see where the 2nd most high index has declined compared to the highest.

  You only add 1 if the 2nd above comes after the highest.  You added 1 regardless of the position.

  

• How to find the url of adf application that has been deployed to the glassfish Server? I try but? It is the image of the page.

  Mr President

  This is the page of the glassfish Server

  

  How to find the url of adf application that has been deployed to the glassfish Server? I try but? It is the image of the page.

  

  In the jdev web module are

  [11: 09:38] wrote the Web for F:\backup of AshCMS\AshCMS\ViewController\deploy\AshCMS_ViewController_webapp.war application Module

  [11: 10:33] wrote the Module Enterprise Application to F:\backup of AshCMS\AshCMS\deploy\AshCMS_Project1_AshCMS.ear

  [11: 10:33] Application deployment...

  [11: 14:24] Application deployed successfully.

  [11: 14:24] time to deployment: 8 minutes, 11 seconds

  [11: 14:24]-deployment is complete.  ----

  what url in the browser.

  Concerning

  Mr President.

  I run my application on built-in web logic server and get the url from there

  http://localhost:7101 / ViewController/faces/MainPage

  then simply change the localhost of 7101 to 8081 as below

  http://localhost: 8081, ViewController, faces, MainPage

  and it works

  Concerning

• How to find the child level for each table in a relational model?

  Earthlings,
  
  I need your help, and I know that, "Yes, we can change." Change this thread to a question answered.
  
  So: How to find the child level for each table in a relational model?
  
  I have a database of relacional (9.2), all right?
  

  .
       O /* This is a child who makes N references to each of the follow N parent tables (here: three), and so on. */
      /↑\ Fks
     O"O O" <-- level 2 for first table (circle)
    /↑\ Fks
  "o"o"o" <-- level 1 for middle table (circle)
     ↑ Fk
    "º"

  Tips:
  -Each circle represents a table;
  -Red no tables have foreign key
  -the picture on the front line of tree, for example, a level 3, but when 3 becomes N? How is N? That is the question.
  
  I started to think about the following:
  
  First of all, I need to know how to take the kids:

  select distinct child.table_name child
    from all_cons_columns father
    join all_cons_columns child
   using (owner, position)
    join (select child.owner,
                 child.constraint_name fk,
                 child.table_name child,
                 child.r_constraint_name pk,
                 father.table_name father
            from all_constraints father, all_constraints child
           where child.r_owner = father.owner
             and child.r_constraint_name = father.constraint_name
             and father.constraint_type in ('P', 'U')
             and child.constraint_type = 'R'
             and child.owner = 'OWNER') aux
   using (owner)
   where child.constraint_name = aux.fk
     and child.table_name = aux.child
     and father.constraint_name = aux.pk
     and father.table_name = aux.father;

  Thought...
  We will share!
  
  Thanks in advance,
  Philips
  
  Published by: BluShadow on April 1st, 2011 15:08
  formatting of code and hierarchy for readbility

  Have you looked to see if there is a cycle in the graph of dependence? Is there a table that has a foreign key to B and B has a back of A foreign key?

  SQL> create table my_emp (
    2    emp_id number primary key,
    3    emp_name varchar2(10),
    4    manager_id number
    5  );
  
  Table created.
  
  SQL> ed
  Wrote file afiedt.buf
  
    1  create table my_mgr (
    2    manager_id number primary key,
    3    employee_id number references my_emp( emp_id ),
    4    purchasing_authority number
    5* )
  SQL> /
  
  Table created.
  
  SQL> alter table my_emp
    2    add constraint fk_emp_mgr foreign key( manager_id )
    3         references my_mgr( manager_id );
  
  Table altered.
  
  SQL> ed
  Wrote file afiedt.buf
  
    1   select level lvl,
    2          child_table_name,
    3          sys_connect_by_path( child_table_name, '/' ) path
    4     from (select parent.table_name      parent_table_name,
    5                  parent.constraint_name parent_constraint_name,
    6                  child.table_name        child_table_name,
    7                  child.constraint_name   child_constraint_name
    8             from user_constraints parent,
    9                  user_constraints child
   10            where child.constraint_type = 'R'
   11              and parent.constraint_type = 'P'
   12              and child.r_constraint_name = parent.constraint_name
   13           union all
   14           select null,
   15                  null,
   16                  table_name,
   17                  constraint_name
   18             from user_constraints
   19            where constraint_type = 'P')
   20    start with child_table_name = 'MY_EMP'
   21*  connect by prior child_table_name = parent_table_name
  SQL> /
  ERROR:
  ORA-01436: CONNECT BY loop in user data
  

  If you have a cycle, you have some problems.

  (1) it is a NOCYCLE keyword does not cause the error, but that probably requires an Oracle version which is not so far off support. I don't think it was available at the time 9.2 but I don't have anything old enough to test on

  SQL> ed
  Wrote file afiedt.buf
  
    1   select level lvl,
    2          child_table_name,
    3          sys_connect_by_path( child_table_name, '/' ) path
    4     from (select parent.table_name      parent_table_name,
    5                  parent.constraint_name parent_constraint_name,
    6                  child.table_name        child_table_name,
    7                  child.constraint_name   child_constraint_name
    8             from user_constraints parent,
    9                  user_constraints child
   10            where child.constraint_type = 'R'
   11              and parent.constraint_type = 'P'
   12              and child.r_constraint_name = parent.constraint_name
   13           union all
   14           select null,
   15                  null,
   16                  table_name,
   17                  constraint_name
   18             from user_constraints
   19            where constraint_type = 'P')
   20    start with child_table_name = 'MY_EMP'
   21*  connect by nocycle prior child_table_name = parent_table_name
  SQL> /
  
         LVL CHILD_TABLE_NAME               PATH
  ---------- ------------------------------ --------------------
           1 MY_EMP                         /MY_EMP
           2 MY_MGR                         /MY_EMP/MY_MGR
           1 MY_EMP                         /MY_EMP
           2 MY_MGR                         /MY_EMP/MY_MGR
  

  (2) If you try to write on a table and all of its constraints in a file and do it in a valid order, the entire solution is probably wrong. It is impossible, for example, to generate the DDL for MY_EMP and MY_DEPT such as all instructions for a table come first, and all the instructions for the other are generated second. So even if NOCYCLE to avoid the error, you would end up with an invalid DDL script. If that's the problem, I would rethink the approach.

  -Generate the DDL for all tables without constraint
  -Can generate the DDL for all primary key constraints
  -Can generate the DDL for all unique key constraints
  -Can generate the DDL for all foreign key constraints

  This is not solidarity all the DOF for a given in the file object. But the SQL will be radically simpler writing - there will be no need to even look at the dependency graph.

  Justin

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