How to reference a column internal table nested - without a name?

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  Florian.
  
  Published by: fschulze on October 16, 2009 13:36

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  Dear Experts,
  I create 2 tables using the object type. the VESSEL_PARAM table contains the list of the parameters allowed.
  The table VESSEL_TYPE containe single item we list some parameters.
  
  On this table, I love the column VESSEL_PARAM table VESSEL_PARAM to check if the settings are and the reference value is allowed.
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  ALTER TABLE VESSEL_PARAM_TAB ADD CONSTRAINT FK_VESSEL_TYPE FOREIGN KEY (NAME, DATA_VALUE)
  REFERENCES VESSEL_PARAM (PARAM_NAME, LIST_PARAM_VALUE. DATA_VALUE)
  

  CREATE OR REPLACE TYPE OBJ_PARAM_VALUE AS OBJECT 
  ( 
    DATA_VALUE  VARCHAR2(20)
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  /
  
  CREATE OR REPLACE TYPE LIST_PARAM_VALUE AS TABLE OF OBJ_PARAM_VALUE;
  /
  
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  CREATE OR REPLACE TYPE OBJ_PARAM_NAME UNDER OBJ_PARAM_VALUE (
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  /
  
  CREATE OR REPLACE TYPE LIST_PARAM_NAME AS TABLE OF OBJ_PARAM_NAME;
  /
  
  Prompt create table VESSEL_PARAM;
  CREATE TABLE VESSEL_PARAM (
     PARAM_NAME   VARCHAR2(20) NOT NULL
    ,PARAM_DESC   VARCHAR2(125)
    ,PARAM_VALUE  LIST_PARAM_VALUE
    ,CONSTRAINT PK_VESSEL_PARAM PRIMARY KEY (PARAM_NAME)
  ) 
  NESTED TABLE PARAM_VALUE STORE AS PARAM_VALUE_TAB
  TABLESPACE CMS_ADMDATA;
  /
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  /
  SHOW ERROR;
  
  Prompt create table CMS_ADM.VESSEL_TYPE;
  CREATE TABLE CMS_ADM.VESSEL_TYPE (
    VESSEL_TYPE  VARCHAR2(20) NOT NULL
   ,VESSEL_DESC  VARCHAR2(125)
   ,VESSEL_PARAM LIST_PARAM_NAME
   ,CONSTRAINT PK_VESSEL_TYPE PRIMARY KEY (VESSEL_TYPE)
  -- ,CONSTRAINT FK_VESSEL_TYPE FOREIGN KEY (VESSEL_PARAM) 
  --        REFERENCES VESSEL_PARAM (PARAM_NAME)
  ) 
  NESTED TABLE VESSEL_PARAM STORE AS VESSEL_PARAM_TAB
  TABLESPACE CMS_ADMDATA;
  /
  ALTER TABLE VESSEL_PARAM_TAB ADD CONSTRAINT UN_VESSEL_PARAM_TAB UNIQUE (NAME);
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  /
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  Could you please indicate your answer as correct if you judge them correct.

  Best regards

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  Oracle running on Oracle Linux 6.4 12.1.0.2.0 database:

  During his studies of FUSION with invisible columns, I discovered that invisible columns in the target table cannot be read. Workaround seems to be

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  However, the documentation does not seem to allow this. Here are the details.

  Test data

  > CREATE TABLE t_target(
    k1 NUMBER PRIMARY KEY,
    c1 NUMBER,
    i1 NUMBER invisible
  )
  
  table T_TARGET created.
  
  > INSERT INTO t_target (k1,c1,i1)
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  SELECT 3, 3, 3 FROM dual
  UNION ALL
  SELECT 4, 4, 4 FROM dual
  
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    k1 NUMBER PRIMARY KEY,
    c1 NUMBER,
    i1 NUMBER invisible
  )
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  First try

  Please note that I have a WHERE clause in the WHEN MATCHED clause. Its purpose is to avoid the update of a row when data are already correct. The WHERE clause is trying to read the invisible column of the target table.

  > MERGE INTO t_target o
  USING (
    SELECT k1, c1, i1 FROM t_source
  ) n
  ON (o.k1 = n.k1)
  WHEN MATCHED THEN UPDATE SET
    c1=n.c1, i1=n.i1
    WHERE 1 IN (
      decode(o.c1,n.c1,0,1),
      decode(o.i1,n.i1,0,1)
    )
  WHEN NOT MATCHED THEN INSERT
    (k1, c1, i1)
    VALUES(n.k1, n.c1, n.i1)
  ...
  Error at Command Line : 10 Column : 12
  Error report -
  SQL Error: ORA-00904: "O"."I1": invalid identifier
  

  As you can see, I put a subquery after the USING clause so that 'n.i1' would be 'visible', but this is not enough since the 'I1' column in the target table is always invisible.

  Second test

  > MERGE INTO (
    SELECT k1, c1, i1 FROM t_target
  ) o
  USING (
    SELECT k1, c1, i1 FROM t_source
  ) n
  ON (o.k1 = n.k1)
  WHEN MATCHED THEN UPDATE SET
    c1=n.c1, i1=n.i1
    WHERE 1 IN (
      decode(o.c1,n.c1,0,1),
      decode(o.i1,n.i1,0,1)
    )
  WHEN NOT MATCHED THEN INSERT
    (k1, c1, i1)
    VALUES(n.k1, n.c1, n.i1)
  
  2 rows merged.
  

  Here I used a subquery in the INTO clause thus, and it worked.

  Unfortunately, this does not seem to be admitted in the documentation: IN fact refers to a table or a view as schema objects.

  

  My question is:

  How can I refer to invisible columns in the target table without creating a new object? My workaround using a subquery solution seems to work very well, but can I recommend if it is not documented?

  Can I replace a "inline view" for a view and still be supported?

  During his studies of FUSION with invisible columns, I discovered that invisible columns in the target table cannot be read. Workaround seems to be

  However, the documentation does not seem to allow this. Here are the details.

  Here I used a subquery in the INTO clause thus, and it worked.

  Unfortunately, this does not seem to be admitted in the documentation: IN fact refers to a table or a view as schema objects.

  My question is:

  How can I refer to invisible columns in the target table without creating a new object? My workaround using a subquery solution seems to work very well, but can I recommend if it is not documented?

  Can I replace a "inline view" for a view and still be supported?

  But the documentation DO ALLOWS not only! You use a view - a view online and those that can be changed in a MERGE statement.

  All versions of the doc for FUSION since 9i specifically say this:

  INTO clause

  Use the INTO target clause to specify the table or view you are updating or inserting into. To merge the data in a view, the view must be updated. Please refer to the "Notes on the editable views" for more information.

  Here are the links for the doc. 9i, 10g, 11g and c 12, ALL OF THEM (the last three), except 9i have this EXACT clause above.

  SQL statements: INDICATED to ROLLBACK FALLS, 15 of 19

  http://docs.Oracle.com/CD/B19306_01/server.102/b14200/statements_9016.htm

  http://docs.Oracle.com/CD/B28359_01/server.111/b28286/statements_9016.htm

  https://docs.Oracle.com/database/121/SQLRF/statements_9016.htm

  9i doc does not have this specific quote in the INTO clause section, but it doesn't have that quote a little later:

  Limitation of the update of a view

  • You cannot specify DEFAULT when refreshing a view.
  • You cannot update a column referenced in the ON condition clause.

  merge_insert_clause

  The merge_insert_clause specifies the values to insert into the column of the target table, if the condition of the ON clause is false. If the insert clause is executed, then all insert triggers defined on the target table are activated.

  Restrictions on the merger in a view

  You cannot specify DEFAULT when refreshing a view.

  If your "workaround" isn't really a workaround solution. You SHOULD use an inline view if you need to reference a column "invisible" in the target table, since otherwise, these columns are INVISIBLE!

  My workaround using a subquery solution seems to work very well, but can I recommend if it is not documented?

  You can recomment it because IT IS documented.

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  Hi all
  
  In our project requirement, we are supposed to create a table1 consisting of such object1 of the column and Object1 has a nested object (object2) as one of the column.
  
  We are able to create the table (table-name is op_sam) for object1
  
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  ORA-22913: must specify the name of the table for the nested table column or attribute · nested tables ·
  
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  Hello

  Each object of type table needs a nested table.
  Subject: object2 has a nested table object: workobj
  Then, who also has a nested table clause.

  CREATE
       TABLE prepop
       (
            ob_id VARCHAR2(20)
       , object2 t_op_sam_obj
       )
       nested TABLE object2 store AS nested_tab1
       (
            nested TABLE workobj store AS nested_tab2
       )
          return as value
  ;
  

  This will create 3 tables:
  nested_tab2 as an embedded table
  nested_tab1 as an embedded table
  prepop

  Kind regards

  Peter