Query to select other records and then the same in 2 tables

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  Oracle 10 g 2 Enterprise Edition.
  
  Hello
  
  I'm writing a logic to find records in a parent table, who have the same values in a child table.
  This is part of a larger application, but I am stuck on that part for now, so I have mocked some of the below simplified tables to capture the heart of the
  the problem is that I'm stuck.
  Let's say I have a responsible parent, child employee table table and there are a number of many relationships between them.
  The aptly named Join_Table manages the relationship between them. If a manager can manage several employees, an employee can be managed by
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  CREATE TABLE manager (
   id      number primary key,
   name      varchar2(100));
  
  -- child table 
  CREATE TABLE employee (
   id          number primary key,
   name      varchar2(100));
  
  -- link table
  CREATE TABLE join_table (
   manager_id          NUMBER, 
   employee_id      NUMBER,
   CONSTRAINT join_table_pk PRIMARY KEY (manager_id, employee_id),
   CONSTRAINT manager_fk FOREIGN KEY (manager_id) REFERENCES manager(id),
   CONSTRAINT employee_fk FOREIGN KEY (employee_id) REFERENCES employee(id) 
   );
  
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  INSERT INTO manager (id, name) VALUES (1, 'John');
  INSERT INTO manager (id, name) VALUES (2, 'Bob');
  INSERT INTO manager (id, name) VALUES (3, 'Mary');
  INSERT INTO manager (id, name) VALUES (4, 'Sue');
  INSERT INTO manager (id, name) VALUES (5, 'Alan');
  INSERT INTO manager (id, name) VALUES (6, 'Mike');
  
  -- Insert some employees 
  INSERT INTO employee (id, name) VALUES (101, 'Paul');
  INSERT INTO employee (id, name) VALUES (102, 'Simon');
  INSERT INTO employee (id, name) VALUES (103, 'Ken');
  INSERT INTO employee (id, name) VALUES (104, 'Kevin');
  INSERT INTO employee (id, name) VALUES (105, 'Jack');
  INSERT INTO employee (id, name) VALUES (106, 'Jennifer');
  INSERT INTO employee (id, name) VALUES (107, 'Tim');
  
  -- Insert the links
  -- John manages Paul, Simon, Ken
  INSERT INTO join_table (manager_id, employee_id) VALUES (1, 101);
  INSERT INTO join_table (manager_id, employee_id) VALUES (1, 102);
  INSERT INTO join_table (manager_id, employee_id) VALUES (1, 103);
  -- Bob manages Paul, Simon, Kevin, Jack
  INSERT INTO join_table (manager_id, employee_id) VALUES (2, 101);
  INSERT INTO join_table (manager_id, employee_id) VALUES (2, 102);
  INSERT INTO join_table (manager_id, employee_id) VALUES (2, 104);
  INSERT INTO join_table (manager_id, employee_id) VALUES (2, 105);
  -- Mary manages Jennifer, Tim
  INSERT INTO join_table (manager_id, employee_id) VALUES (3, 106);
  INSERT INTO join_table (manager_id, employee_id) VALUES (3, 107);
  -- Sue manages Jennifer, Tim
  INSERT INTO join_table (manager_id, employee_id) VALUES (4, 106);
  INSERT INTO join_table (manager_id, employee_id) VALUES (4, 107);
  -- Alan manages Paul, Simon, Ken, Jennifer, Tim
  INSERT INTO join_table (manager_id, employee_id) VALUES (5, 101);
  INSERT INTO join_table (manager_id, employee_id) VALUES (5, 102);
  INSERT INTO join_table (manager_id, employee_id) VALUES (5, 103);
  INSERT INTO join_table (manager_id, employee_id) VALUES (5, 106);
  INSERT INTO join_table (manager_id, employee_id) VALUES (5, 107);
  -- Mike manages Paul, Simon, Ken
  INSERT INTO join_table (manager_id, employee_id) VALUES (6, 101);
  INSERT INTO join_table (manager_id, employee_id) VALUES (6, 102);
  INSERT INTO join_table (manager_id, employee_id) VALUES (6, 103);
  
  -- For sanity
  CREATE UNIQUE INDEX employee_name_uidx ON employee(name);

  If I ask for Manager John, so I want to find other managers who manage the exact list and even employees.
  Answer should be Mike.
  If I ask for Manager of Mary, the answer should be Sue.
  
  This query will give me the list of managers who manage some of the same employees as John, but not the same employees accurate...

  SELECT DISTINCT m.name AS manager
  FROM manager m, join_table jt, employee e
  WHERE m.id = jt.manager_id
  AND jt.employee_id = e.id
  AND e.id IN (
       SELECT e.id
       FROM manager m, join_table jt, employee e
       WHERE m.id = jt.manager_id
       AND jt.employee_id = e.id
       AND m.name = 'John')
  ORDER BY 1;

  I thought about using set operations to find managers with a list of employees less than my employees is null and where my employees under their list of employees is null. But there must be an easier way more elegant.
  Any ideas?
  BTW, I need to run as a batch on tables with > 20 million rows so the efficiency of queries is key.

  What about...

  WITH manager_list AS
  (
   SELECT name,
          LTRIM(MAX(SYS_CONNECT_BY_PATH(id,','))
          KEEP (DENSE_RANK LAST ORDER BY curr),',') AS employees
   FROM   (SELECT m.name,
                  e.id,
                  ROW_NUMBER() OVER (PARTITION BY m.name ORDER BY e.id) AS curr,
                  ROW_NUMBER() OVER (PARTITION BY m.name ORDER BY e.id) -1 AS prev
           FROM   manager m,
                  join_table jt,
                  employee e
    WHERE m.id           = jt.manager_id
    AND   jt.employee_id = e.id
    AND   m.name = :P_MANAGER)
    GROUP BY name
    CONNECT BY prev = PRIOR curr AND name = PRIOR name
    START WITH curr = 1
  ), all_list AS
  (
   SELECT name,
          LTRIM(MAX(SYS_CONNECT_BY_PATH(id,','))
          KEEP (DENSE_RANK LAST ORDER BY curr),',') AS employees
   FROM   (SELECT m.name,
                  e.id,
                  ROW_NUMBER() OVER (PARTITION BY m.name ORDER BY e.id) AS curr,
                  ROW_NUMBER() OVER (PARTITION BY m.name ORDER BY e.id) -1 AS prev
           FROM   manager m,
                  join_table jt,
                  employee e
    WHERE m.id           = jt.manager_id
    AND   jt.employee_id = e.id)
    GROUP BY name
    CONNECT BY prev = PRIOR curr AND name = PRIOR name
    START WITH curr = 1
  )
  SELECT a.*
  FROM   manager_list m,
         all_list a
  WHERE  m.employees = a.employees
  

  Would be easier in 11g, but I do not have a facility here so this is based on 10g.

  See you soon

  Ben

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  Hi all
  
  I have records as follows:
  
  Program name Effective_Date Valid_Flag
  N 10/02/2012 ABCD
  N 14/02/2012 ABCD
  ABCD 20/02/2012 Y
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  ssk1974 wrote:
  Hi all

  I have records as follows:

  Program name Effective_Date Valid_Flag
  N 10/02/2012 ABCD
  N 14/02/2012 ABCD
  ABCD 20/02/2012 Y
  N 01/03/2012 ABCD
  N 10/03/2012 ABCD
  ABCD 14/03/2012 Y
  N 25/03/2012 ABCD
  N 26/03/2012 ABCD
  N 27/03/2012 ABCD
  N 28/03/2012 ABCD
  N 29/03/2012 ABCD
  ABCD 25/04/2012 Y

  I have to write a select statement to keep the first record and then only pull records when the Valid_Flag has changed. The result set should be as below.

  Program name Effective_Date Valid_Flag
  ABCD 10/02/2012 N - I kept the first record
  20/02/2012 ABCD is - Valid_Flag chages to a Y for the first time and so on.
  N 01/03/2012 ABCD
  ABCD 14/03/2012 Y
  N 25/03/2012 ABCD
  ABCD 25/04/2012 Y

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    2  (
    3     select 'ABCD' as col1, to_date('2/10/2012', 'mm/dd/yyyy')       as col2, 'N' as col3    from dual union all
    4     select 'ABCD' as col1, to_date('2/14/2012', 'mm/dd/yyyy')       as col2, 'N' as col3    from dual union all
    5     select 'ABCD' as col1, to_date('2/20/2012', 'mm/dd/yyyy')       as col2, 'Y' as col3    from dual union all
    6     select 'ABCD' as col1, to_date('3/01/2012', 'mm/dd/yyyy')       as col2, 'N' as col3    from dual union all
    7     select 'ABCD' as col1, to_date('3/10/2012', 'mm/dd/yyyy')       as col2, 'N' as col3    from dual union all
    8     select 'ABCD' as col1, to_date('3/14/2012', 'mm/dd/yyyy')       as col2, 'Y' as col3    from dual union all
    9     select 'ABCD' as col1, to_date('3/25/2012', 'mm/dd/yyyy')       as col2, 'N' as col3    from dual union all
   10     select 'ABCD' as col1, to_date('3/26/2012', 'mm/dd/yyyy')       as col2, 'N' as col3    from dual union all
   11     select 'ABCD' as col1, to_date('3/27/2012', 'mm/dd/yyyy')       as col2, 'N' as col3    from dual union all
   12     select 'ABCD' as col1, to_date('3/28/2012', 'mm/dd/yyyy')       as col2, 'N' as col3    from dual union all
   13     select 'ABCD' as col1, to_date('3/29/2012', 'mm/dd/yyyy')       as col2, 'N' as col3    from dual union all
   14     select 'ABCD' as col1, to_date('4/25/2012', 'mm/dd/yyyy')       as col2, 'Y' as col3    from dual
   15  )
   16  select *
   17  from
   18  (
   19     select
   20             col1, col2, col3,
   21             lag(col3) over (partition by col1 order by col2 asc) as last_flag
   22     from data
   23  )
   24  where last_flag    != col3
   25  or    last_flag    is null;
  
  COL1         COL2                       COL LAS
  ------------ -------------------------- --- ---
  ABCD         10-FEB-2012 12 00:00       N
  ABCD         20-FEB-2012 12 00:00       Y   N
  ABCD         01-MAR-2012 12 00:00       N   Y
  ABCD         14-MAR-2012 12 00:00       Y   N
  ABCD         25-MAR-2012 12 00:00       N   Y
  ABCD         25-APR-2012 12 00:00       Y   N
  
  6 rows selected.
  
  Elapsed: 00:00:00.08
  ME_XE?
  

  See you soon,.

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