How remove the line by line by comparing to the first column?

Hello!

I have a problem - I need to remove the line by line, but the problem is, I know that the first COLUMN of the table is a PK.
To retrieve the NAME of the COLUMN that I use:

SELECT column_name, table_name FROM USER_TAB_COLUMNS WHERE column_id = 1 and table_name = c1.tmp_table_name;
But it does not somehow.
Below you can see my script (which has not worked for now):

declare
XXX varchar2 (100);
Start
C1 in (select table_name, tmp_tables tmp_table_name) loop
IMMEDIATE EXECUTION
' SELECT column_name in ' | xxx | "USER_TAB_COLUMNS WHERE column_id = 1 AND table_name = ' |" ' || C1.tmp_table_name | " ' ;
immediate execution
"start."
for c2 in (select * from ' | c1.tmp_table_name | start loop ')
Insert into ' | C1.table_name | "values c2; delete from ' | C1.tmp_table_name | 'where ' | xxx |' = c2.' | xxx |'; exception: when other then null; end; end loop; end;';
end loop;
end;

P.S. The Inserts work perfect. I have a problem with deleting lines that are in c1.table_name, of c1.tmp_table_name (the two tables have the same structure, PK, always), because I have the names of columns different another tables which are PK. (for example: K, ID, NS and so on) Please help me to write the correct script.
For example this will be for the first line recovered as:
Start
C1 in (select table_name, tmp_tables tmp_table_name) loop
immediate execution
«Start for c2 in (select * from ' |)» C1.tmp_table_name | Start loop ')
Insert into ' | C1.table_name | "values c2; delete from ' | C1.tmp_table_name: ' where K = c2. K; exception: when other then null; end; end loop; end;';
end loop;
end;
This script works perfectly. But I have many other tables with different PK - K No.

Solution with the logging of errors table

-- create the error-logging table
CREATE TABLE tbl_MergeErrors (
    Stamp       TIMESTAMP(3),
    TableName   VARCHAR2(30),
    KeyColumn   VARCHAR2(30),
    KeyValue    VARCHAR2(4000),
    ErrorCode   NUMBER(5),
    ErrorMsg    VARCHAR2(4000),

  CONSTRAINT pk_MergeErrors
      PRIMARY KEY (TableName, Stamp)
      USING INDEX
)
/

-- procedure to insert errors
CREATE OR REPLACE
PROCEDURE LogMergeError (pTableName  IN VARCHAR2,
                         pKeyColumn  IN VARCHAR2,
                         pKeyValue   IN VARCHAR2)
IS PRAGMA AUTONOMOUS_TRANSACTION;

    -- you couldn't insert SQLCODE or SQLERRM directly into a table (ORA-00984)
    nSQLCODE   NUMBER(5)      := SQLCODE;
    vcSQLERRM  VARCHAR2(4000) := SQLERRM;

BEGIN
  INSERT INTO tbl_MergeErrors
         (Stamp, TableName, KeyColumn, KeyValue, ErrorCode, ErrorMsg)
      VALUES (SYSTIMESTAMP, RTrim( SubStr( pTableName, 1, 30)),
              RTrim( SubStr( pKeyColumn, 1, 30)), SubStr( pKeyValue, 1, 4000),
              nSQLCODE, vcSQLERRM);
  COMMIT WORK;

-- if an error occured here, then just roll back the autonomous transaction
EXCEPTION
  WHEN OTHERS THEN   ROLLBACK WORK;
END LogMergeError;
/

-- create the tables and insert test-data
CREATE TABLE TMP_TABLES (
    TABLE_NAME       VARCHAR2(200),
    TMP_TABLE_NAME   VARCHAR2(200),
  CONSTRAINT TMP_TABLES_X PRIMARY KEY (TABLE_NAME)
)
/
CREATE TABLE TMP_KL002 (
    K   VARCHAR2(40),
    N   VARCHAR2(200)
)
/
CREATE TABLE TMP_TABLE1 (
    NS   VARCHAR2(40),
    N    VARCHAR2(200)
)
/
CREATE TABLE KL002 (
    K VARCHAR2(40),
    N VARCHAR2(200),
  CONSTRAINT PK_KL002 PRIMARY KEY (K)
)
/
CREATE TABLE TABLE1 (
    NS   VARCHAR2(40),
    N    VARCHAR2(200),
  CONSTRAINT PK_TABLE1 PRIMARY KEY (NS)
)
/ 

INSERT INTO TMP_TABLES (TABLE_NAME, TMP_TABLE_NAME) VALUES ('kl002','tmp_kl002');
INSERT INTO TMP_TABLES (TABLE_NAME, TMP_TABLE_NAME) VALUES ('table1','tmp_table1');
INSERT INTO tmp_KL002 (K, N) VALUES ('00', 'none');
INSERT INTO tmp_KL002 (K, N) VALUES ('07', 'exists');
INSERT INTO tmp_KL002 (K, N) VALUES ('08', 'not assigned');
INSERT INTO tmp_table1 (NS, N) VALUES ('2000', 'basic');
INSERT INTO tmp_table1 (NS, N) VALUES ('3000', 'advanced');
INSERT INTO tmp_table1 (NS, N) VALUES ('4000', 'custom');
COMMIT WORK;

-- to test, if it works correct when primary key values exists before
INSERT INTO KL002 VALUES ('07', 'exists before');
COMMIT WORK;

-- check the data before execution
SELECT * FROM TMP_KL002 ORDER BY K;
SELECT * FROM KL002 ORDER BY K;
SELECT * FROM TMP_TABLE1 ORDER BY NS;
SELECT * FROM TABLE1 ORDER BY NS;

-- empty the error-logging table
TRUNCATE TABLE tbl_MergeErrors DROP STORAGE; 

-- a solution
DECLARE

    PLSQL_BLOCK  CONSTANT VARCHAR2(256) := '
BEGIN
  FOR rec IN (SELECT * FROM <0>) LOOP
    BEGIN
      INSERT INTO <1> VALUES rec;
      DELETE FROM <0> t WHERE (t.<2> = rec.<2>);
    EXCEPTION
      WHEN OTHERS THEN
          LogMergeError( ''<1>'', ''<2>'', rec.<2>);
    END;
  END LOOP;
END;';

BEGIN
  FOR tabcol IN (SELECT t.Tmp_Table_Name, t.Table_Name, c.Column_Name
                 FROM Tmp_Tables t,
                      User_Tab_Columns c
                 WHERE     (c.Table_Name = Upper( t.Tmp_Table_Name))
                       AND (c.Column_ID = 1)
            ) LOOP
    EXECUTE IMMEDIATE Replace( Replace( Replace( PLSQL_BLOCK,
                               '<0>', tabcol.Tmp_Table_Name),
                               '<1>', tabcol.Table_Name),
                               '<2>', tabcol.Column_Name);
  END LOOP;
END;
/ 

-- check the data after execution ...
SELECT * FROM TMP_KL002 ORDER BY K;
SELECT * FROM KL002 ORDER BY K;
SELECT * FROM TMP_TABLE1 ORDER BY NS;
SELECT * FROM TABLE1 ORDER BY NS;

-- ... and also the error-logging table
SELECT * FROM tbl_MergeErrors ORDER BY Stamp, TableName;

-- of couse you must issue an COMMIT (the ROLLBACK is only for testing
ROLLBACK WORK;

-- drop the test-tables
DROP TABLE TABLE1 PURGE;
DROP TABLE KL002 PURGE;
DROP TABLE TMP_TABLE1 PURGE;
DROP TABLE TMP_KL002 PURGE;
DROP TABLE TMP_TABLES PURGE;

-- you shouldn't drop the error-logging table, but I use it to free up my db
DROP TABLE tbl_MergeErrors PURGE;

Greetings, Niels

Tags: Database

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