VLD-2761: A corresponding column cannot be updated in a merge statement

Similar Questions

• Error: Not nullable column cannot be updated to null

  Error code.
  
  Code...-2147217887
  Description... Not nullable column cannot be updated to null.
  
  I'm doing an FDM of connection ODBC import. One of the column in the oracle database is assigned to the property "AllowNull" (impossible to change the ownership of the source table) and I try to import in the amount field in the staging table that has a property of 'NoNull' and there is therefore a conflict.
  
  Thank you.

  Just do a few null checks in your script integration and ignore the rows of data that are null. A simple way to do is to use IsNull (field in your source) to check if the source value is null. In this case do not import this data line.

• VLD-2761: impossible to generate the merge statement

  Hi pros,.
  
  I received this warning from validation on my complex mapping:
  
  "Merge statement cannot be generated because the SUPPCODE column is used for correspondence and updating. A column cannot be updated in a merge statement.
  
  I think that happens because of the restraint newly added to the target table that is used in my map, but what exactly does that mean?

  This means that the column THAT SUPPCODE is used as a correspondent and update.
  Click on SUPPCODE and check the attribute property

  Load when updating column lines = Yes
  Matches columns when updating rows = Yes

  So the merger will not be generated for this

  (The answer is mark as correct if it's useful)

  See you soon
  Katia

  Published by: Katia on April 28, 2010 06:13

• Merge statement: update only when a difference

  Hello
  
  I have two tables have almost the same columns, how can I use the merge statement to update the table target only when there is difference between the source and target table. Is there an easier way to do not compare every column one by one? I use Oracle 11.2.
  
  
  Here's the MERGE statement:
  
  Merge into trgt tb_trgt using tb_src src
  on (src.id = trgt.id)
  When not matched then values of insertion (trgt.id, trgt.nm, trgt.addr) (src.id, src.nm, src.nm)
  when matched, then update set trgt.nm = src.nm, trgt.addr = src.addr
  where trgt.nm <>src.nm or trgt.addr <>src.addr
  ;
  
  Is there an easier way to clarify the clause in the NO MATCHED? I don't want to compare every column in the tables. Because I might have a lot of columns in tables.
  
  Thank you

  939569 wrote:
  I have two tables have almost the same columns, how can I use the merge statement to update the table target only when there is difference between the source and target table. Is there an easier way to do not compare every column one by one? I use Oracle 11.2.
  Is there an easier way to clarify the clause in the NO MATCHED? I don't want to compare every column in the tables. Because I might have a lot of columns in tables.

  I use the method of Tom Kyte to compare tables; It gives me the differences between the source and the target using GROUP BY, who manages the value NULL comparisons. Can I use this result in the MERGER. Here is a step by step illustration. First, set up test data:

  define num_rows = 10
  /
  define pct = 20
  /
  define value_length = 50
  /
  define num_mods = round((&num_rows/3)*(&pct/100),0)
  /
  DROP TABLE T_TARGET;
  /
  DROP TABLE T_SOURCE;
  /
  create table t_target(key1 number, value1 varchar2(&value_length), constraint pk_target primary key(key1));
  insert /*+ append */ into t_target
  select level+&num_mods*3, rpad('DO NOTHING - same in source and target ',&value_length, '*')
  from dual
  where level <= &num_rows-&num_mods*2 connect by level <= &num_rows-&num_mods*2;
  /
  create table t_source as select * from t_target;
  /
  insert into t_source
  select level, rpad('INSERT - in source, not in target ',&value_length, '*')
  from dual where level <= &num_mods connect by level <= &num_mods;
  /
  insert into t_target
  select level+&num_mods, rpad('DELETE (after update) - not in source, in target ',&value_length, '*')
  from dual where level <= &num_mods connect by level <= &num_mods;
  /
  insert into t_source
  select level+&num_mods*2, rpad('UPDATE - put this in target ',&value_length, '*')
  from dual where level <= &num_mods connect by level <= &num_mods;
  /
  insert into t_target
  select level+&num_mods*2, rpad('UPDATE - update this from source ',&value_length, '*')
  from dual where level <= &num_mods connect by level <= &num_mods;
  /
  commit;
  /
  select 't_target', count(*), value1 from t_target group by 't_target', value1
  union all
  select 't_source', count(*), value1 from t_source group by 't_source', value1;
  /
  'T_TARGET'   COUNT(*) VALUE1
  ---------- ---------- --------------------------------------------------
  t_target            1 UPDATE - update this from source *****************
  t_target            8 DO NOTHING - same in source and target ***********
  t_target            1 DELETE (after update) - not in source, in target *
  t_source            1 UPDATE - put this in target **********************
  t_source            8 DO NOTHING - same in source and target ***********
  t_source            1 INSERT - in source, not in target ****************
  

  So, I need to do an insert, update, and a delete.

  Now I'll build code comparison step by step. I don't show the results every time, but if you run each query yourself can see what is happening.

  -- Step by step build of "refresh by merge" USING ROWIDs
  -- Result: with cardinality hint, can use "BY USER ROWID" and avoid 3d full scan
  -- 1) Full scan of both tables to get data,
  -- identify old / new records and get old ROWID
  select KEY1,VALUE1,
  1 old_cnt, 0 new_cnt, rowid rid from T_TARGET o
  UNION ALL
  SELECT KEY1,VALUE1,
  0 old_cnt, 1 new_cnt, NULL FROM T_SOURCE n
  /
  -- 2) GROUP BY compares records, identical records have old_cnt = new_cnt
  select KEY1,VALUE1,
  sum(old_cnt) old_cnt, sum(new_cnt) new_cnt, max(rid) rid
  FROM (
    select KEY1,VALUE1,
    1 old_cnt, 0 new_cnt, rowid rid from T_TARGET o
    UNION ALL
    SELECT KEY1,VALUE1,
    0 old_cnt, 1 new_cnt, NULL FROM T_SOURCE n
  )
  group by KEY1,VALUE1
  /
  -- 3) Filter out identical records
  select KEY1,VALUE1,
  sum(old_cnt) old_cnt, sum(new_cnt) new_cnt, max(rid) rid
  FROM (
    select KEY1,VALUE1,
    1 old_cnt, 0 new_cnt, rowid rid from T_TARGET o
    UNION ALL
    SELECT KEY1,VALUE1,
    0 old_cnt, 1 new_cnt, NULL FROM T_SOURCE n
  )
  group by KEY1,VALUE1
  having sum(old_cnt) <> sum(new_cnt)
  /
  -- 4) for INSERT, keep NEW; for DELETE, keep OLD;
  -- for UPDATE, keep NEW values and OLD rid
  SELECT /*+ cardinality(1) */ KEY1,VALUE1,
  old_cnt, new_cnt, row_number() OVER(PARTITION BY KEY1 ORDER BY old_cnt) rn
  , max(rid) over(partition by key1) rid
  from (
    select KEY1,VALUE1,
    sum(old_cnt) old_cnt, sum(new_cnt) new_cnt, max(rid) rid
    FROM (
      select KEY1,VALUE1,
      1 old_cnt, 0 new_cnt, rowid rid from T_TARGET o
      UNION ALL
      SELECT KEY1,VALUE1,
      0 old_cnt, 1 new_cnt, NULL FROM T_SOURCE n
    )
    group by KEY1,VALUE1
    having sum(old_cnt) <> sum(new_cnt)
  )
  /
  -- 5) Filter out OLD UPDATE record, not needed
  SELECT KEY1,VALUE1,
  new_cnt, rid
  FROM (
    SELECT /*+ cardinality(1) */ KEY1,VALUE1,
    old_cnt, new_cnt, row_number() OVER(PARTITION BY KEY1 ORDER BY old_cnt) rn
    , max(rid) over(partition by key1) rid
    from (
      select KEY1,VALUE1,
      sum(old_cnt) old_cnt, sum(new_cnt) new_cnt, max(rid) rid
      FROM (
        select KEY1,VALUE1,
        1 old_cnt, 0 new_cnt, rowid rid from T_TARGET o
        UNION ALL
        SELECT KEY1,VALUE1,
        0 old_cnt, 1 new_cnt, NULL FROM T_SOURCE n
      )
      group by KEY1,VALUE1
      having sum(old_cnt) <> sum(new_cnt)
    )
  ) where rn = 1
  /
  
  KEY1     VALUE1                                   NEW_CNT     RID
  1     INSERT - in source, not in target ****************     1
  2     DELETE (after update) - not in source, in target *     0     AAAcDHAAMAAAACtAAA
  3     UPDATE - put this in target **********************     1     AAAcDHAAMAAAACtAAB
  

  Now, here's the real MERGER:

  merge into T_TARGET o
  USING (
    SELECT KEY1,VALUE1,
    new_cnt, rid
    FROM (
      SELECT /*+ cardinality(1) */ KEY1,VALUE1,
      old_cnt, new_cnt, row_number() OVER(PARTITION BY KEY1 ORDER BY old_cnt) rn
      , max(rid) over(partition by key1) rid
      from (
        select KEY1,VALUE1,
        sum(old_cnt) old_cnt, sum(new_cnt) new_cnt, max(rid) rid
        FROM (
          select KEY1,VALUE1,
          1 old_cnt, 0 new_cnt, rowid rid from T_TARGET o
          UNION ALL
          SELECT KEY1,VALUE1,
          0 old_cnt, 1 new_cnt, NULL FROM T_SOURCE n
        )
        group by KEY1,VALUE1
        having sum(old_cnt) <> sum(new_cnt)
      )
    ) where rn = 1
  ) n
  on (o.rowid = n.rid)
  when matched then update set
  VALUE1=n.VALUE1
  DELETE WHERE (n.new_cnt = 0)
  WHEN NOT MATCHED THEN INSERT (
    KEY1,VALUE1
  ) VALUES (
    n.KEY1,n.VALUE1
  )
  /
  

  Published by: stew Ashton on February 7, 2013 20:42

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