Choose line tbl detail via button in Master due tbl selectionListener custom 2

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  Andy

• Manually insert a fixed set of detail records in the master record is created

  Hello

  I have a requirement for the creation of several detail records manually when a new Master Record is created.  I'll use information from a few fields of primary record that is created when you create the detail records.  To do this, I put the INSERT statements in 'before Insert trigger"in the main Table (to insert records from the secondary table) . The problem arises when the trigger is trying to insert the record in the secondary table because of the Foreign Key constraint on detail record.  Since the master record is yet to be established, it will not INSERT on detail table and raises foreign key constraint violation.

  One way to overcome this is by simply creating the master record.  And in the master report, providing a button (link column) and execution of a PL/SQL procedure that creates the detail of records.

  I just wanted to know is there a way to do this when creating main drive itself?

  Here's what I defined under master table before creating the trigger-

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    VALUES (v_master_pk_column,:NEW.dealer_account_code,:NEW.invoice_value);
    END IF;
  END;
  
  

  Note: Detail table key primary value automatically filled using his own trigger and sequence.

  Thank you and best regards,

  -Anand

  Hi Anand,

  before the trigger for insertion to complete the primary key of the main table.

  CREATE OR REPLACE TRIGGER  bi_master_table
     before insert  on MASTER_TABLE
     for each row
     begin
      SELECT master_pk_column_seq.NEXTVAL INTO :NEW.master_pk_column FROM DUAL;
     end;
  /
  

  Trigger after Insert to insert the record in the detail table,

  similar to this

  CREATE OR REPLACE TRIGGER  "DETAIL_TABLE_INSERT"
  AFTER INSERT ON MASTER_TABLE
  FOR EACH ROW
  BEGIN
    INSERT INTO detail_table(detail_fk_column,account_code,credit)
    VALUES (:NEW.master_pk_column,:NEW.dealer_account_code,:NEW.invoice_value);
  END;
  /
  

  or you can implement the same writing Pl/Sql procedures without using triggers.

  Check this Doc contains example with or without the help of relaxation: https://markhoxey.wordpress.com/2013/08/20/returning-into/

  Hope this helps you,

  Kind regards

  Jitendra

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  Hello

  I have two tables TAB_MST and TAB_DTL with the information as below:

  {code}

  CREATE TABLE TAB_MST
  (
  NUMBER OF MSTCOL
  )
  /

  ALTER TABLE TAB_MST ADD CONSTRAINT TAB_MST_PK PRIMARY KEY (MSTCOL)
  /

  INSERT INTO TAB_MST (MSTCOL) VALUES (1);
  INSERT INTO TAB_MST (MSTCOL) VALUES (2);
  INSERT INTO TAB_MST (MSTCOL) VALUES (3);
  INSERT INTO TAB_MST (MSTCOL) VALUES (4);

  CREATE TABLE TAB_DTL
  (
  NUMBER OF MSTCOL
  NUMBER OF DTLCOL
  )
  /

  ALTER TABLE TAB_DTL ADD CONSTRAINT TAB_DTL_PK PRIMARY KEY (MSTCOL, DTLCOL)
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  INSERT INTO TAB_DTL (MSTCOL, DTLCOL) VALUES (1, 2);
  INSERT INTO TAB_DTL (MSTCOL, DTLCOL) VALUES (1, 3);
  INSERT INTO TAB_DTL (MSTCOL, DTLCOL) VALUES (1, 4);
  INSERT INTO TAB_DTL (MSTCOL, DTLCOL) VALUES (1, 5);
  INSERT INTO TAB_DTL (MSTCOL, DTLCOL) VALUES (2, 4);
  INSERT INTO TAB_DTL (MSTCOL, DTLCOL) VALUES (2, 7);
  INSERT INTO TAB_DTL (MSTCOL, DTLCOL) VALUES (2, 8);
  INSERT INTO TAB_DTL (MSTCOL, DTLCOL) VALUES (2, 9);
  INSERT INTO TAB_DTL (MSTCOL, DTLCOL) VALUES (3, 8);
  INSERT INTO TAB_DTL (MSTCOL, DTLCOL) VALUES (3, 9);
  INSERT INTO TAB_DTL (MSTCOL, DTLCOL) VALUES (3, 10);
  INSERT INTO TAB_DTL (MSTCOL, DTLCOL) VALUES (3, 11);
  INSERT INTO TAB_DTL (MSTCOL, DTLCOL) VALUES (4, 12);
  INSERT INTO TAB_DTL (MSTCOL, DTLCOL) VALUES (4, 13);
  INSERT INTO TAB_DTL (MSTCOL, DTLCOL) VALUES (4, 14);

  COMMIT;

  {code}

  I want to group the rows in the Master table (TAB_MST) to different groups based on the data in the secondary table (TAB_DTL) with output like below

  MSTCOL GROUPID
  1               1
  2               1
  3               1
  4               2

  Rule for grouping are as follows:

  (1) if there is a common value of DTLCOL for two different values of MSTCOL, then two MSTCOL values should be grouped under the same group, for example for the above case of sample
  DTLCOL (value = 4) is common for MSTCOL = 1 and MSTCOL = 2, so MSTCOL 1 and MSTCOL 2 belong to the same group (GROUPID = 1).
  DTLCOL (value = 8, 9) is common for MSTCOL = 2, MSTCOL = 3, so 3 MSTCOL must belong to the same group as MSTCOL 2 (GROUPID = 1)
  There is no common value of DTLCOL for MSTCOL = 4, so it is in a separate group.

  Here is the PL/SQL block to highlight this grouping behavior. Two temporary tables are created to achieve this:

  {code}

  CREATE TABLE TAB_MST_GROUP
  (
  NUMBER OF MSTCOL
  GROUPID NUMBER
  )
  /

  CREATE TABLE TAB_TMP_GROUP
  (
  GROUPID NUMBER
  )
  /

  
  DECLARE
  CURSOR c1
  IS
  SELECT * FROM tab_mst;

  prevmstcol NUMBER;
  prevgroupid NUMBER: = 1;
  vtmpgroupid NUMBER;
  BEGIN
  DELETE tab_mst_group;

  FOR r1 IN c1
  LOOP
  IF prevmstcol IS NULL
  THEN
  INSERT INTO tab_mst_group
  VALUES (r1.mstcol, prevgroupid);

  prevmstcol: = r1.mstcol;
  ON THE OTHER
  INSERT INTO tab_tmp_group
  SEPARATE SELECT GroupID
  OF tab_mst_group a, tab_dtl b, tab_dtl c
  WHERE a.mstcol = b.mstcol
  AND c.dtlcol = b.dtlcol
  AND c.mstcol = r1.mstcol;

  IF SQL % ROWCOUNT = 0
  THEN
  prevgroupid: = prevgroupid + 1;

  INSERT INTO tab_mst_group
  VALUES (r1.mstcol, prevgroupid);
  ON THE OTHER
  SELECT MIN (groupid) IN the vtmpgroupid OF tab_tmp_group;

  UPDATE tab_mst_group
  SET groupid = vtmpgroupid
  WHERE groupid IN (SELECT tab_tmp_group FROM groupid);

  INSERT INTO tab_mst_group
  VALUES (r1.mstcol, vtmpgroupid);

  SELECT MAX (groupid) IN tab_mst_group prevgroupid;

  DELETE tab_tmp_group;
  END IF;
  END IF;
  END LOOP;
  END;

  {code}

  
  Question:

  a. can achieve us in SQL instead of PL/SQL?
  b. fresh general reading of TAB_DTL grows exponentially if the number of cases in TAB_MST develops. How can we reduce the number of TAB_DTL reading as the real lines of TAB_DTL is very high.

  
  Thank you
  sukhijank

  Hi, Sukhijank,

  Thanks for the additional information.  Has not only learned these details since posting your first message, did you?  If you post information like that in your first post, and then people can use it to give you a better response to the first answer.

  The idea I had for a recursive solution of WITH clause will not work after all.

  I think that the best solution will be in PL/SQL, using a table like tab_mst_group that you posted, but with an extra column:

  CREATE TABLE TAB_MST_GROUP
  (
    mstcol NUMBER PRIMARY KEY,
    groupid   NUMBER,
    levelnum NUMBER
  );
  CREATE INDEX tab_mst_group_groupid_levelnum
  ON     tab_mst_group (levelnum, groupid);
  

  If llevelnum = 0, which means that the allocation of groupid is not certain; If levelnum > 0, then groupid is correct.

  Here is a procedure you can use to fill in the table:

  CREATE OR REPLACE PROCEDURE tab_mst_group_populate
  AS
      new_groupid  tab_mst_group.groupid%TYPE
       := 0;
      new_levelnum tab_mst_group.levelnum%TYPE;
      num_added  PLS_INTEGER;
      truncate_stmt VARCHAR2 (50) := 'TRUNCATE TABLE tab_mst_group';
  BEGIN
      --  *****  Remove old entries from the table  *****
      -- dbms_output.put_line (truncate_stmt || ' = truncate_stmt in tab_mst_group_populate'); -- Debugging
      EXECUTE IMMEDIATE  truncate_stmt;
  
      --  *****  Populate table with all mstcols, and 1-member groups  *****
      INSERT INTO  tab_mst_group (mstcol, groupid, levelnum)
      SELECT    m.mstcol
      ,       m.mstcol  AS groupid
      ,       MIN ( CASE
                       WHEN  o.mstcol IS NULL
       THEN  1
       ELSE  0
                   END
      )  AS lvlnum
      FROM     tab_mst    m
      LEFT JOIN tab_dtl    d ON  d.mstcol = m.mstcol
      LEFT JOIN tab_dtl    o ON  o.dtlcol = d.dtlcol
              AND o.mstcol   != d.mstcol
      GROUP BY    m.mstcol;
  
      --  ***** Get groupid for lowest mstcol that still needs one  *****
      WHILE  new_groupid IS NOT NULL
      LOOP
          SELECT  MIN (groupid)
  INTO new_groupid
  FROM tab_mst_group
  WHERE levelnum = 0;
  IF  new_groupid   IS NOT NULL
  THEN
       --  ***  Confirm groupid for this one mstcol  ***
       UPDATE  tab_mst_group
       SET     levelnum = 1
       WHERE   levelnum = 0
       AND     groupid = new_groupid;
       new_levelnum := 2;
       num_added := 1;
       --  ***  Add neighboring mstcols to this group  ***
  
       WHILE  num_added > 0
       LOOP
           UPDATE  tab_mst_group
    SET groupid   = new_groupid
    , levelnum  = new_levelnum
    WHERE levelnum  = 0
    AND groupid   IN (
                     SELECT  d2.mstcol
              FROM  tab_mst_group g1
        JOIN  tab_dtl       d1  ON  d1.mstcol  = g1.mstcol
        JOIN  tab_dtl       d2  ON  d2.dtlcol  = d1.dtlcol
                      AND d2.mstcol != d1.mstcol
        JOIN  tab_mst_group g2  ON  g2.mstcol  = d2.mstcol
        WHERE  g1.levelnum  = new_levelnum - 1
        AND  g1.groupid   = new_groupid
        AND  g2.levelnum  = 0
           );
    num_added := SQL%ROWCOUNT;
    dbms_output.put_line (num_added || ' = num_added');
           new_levelnum := new_levelnum + 1;
       END LOOP;
  END IF;
      END LOOP;
  
  END tab_mst_group_populate;
  /
  SHOW ERRORS
  

  The basic strategy is that we start assuming that each mstcol will have its own groupid.  The CASE expression in the INSERT statement sets levelnum = 1 for the mstcols that do not exist in the tab_dtl table, or are not related to other mstcols in tab_dtl.  The loop after that looks like for tab_mst_group lines are always 0, which means that the grpupid must still be confirmed or changed.  He begins by finding the lowest mstcol which still has levelnum = 0 and makes a new group.  The inner loop looking for related mstcols and the brand as being in the same group.

  You could combine tab_mst and tab_mst_group; I see no need to have a separate table (but maybe do you).  If combine you them, then you would not truncate the table in the procedure.

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