Variable contents inside "EXECUTE IMMEDIATE" not working properly.

Question

Hello,
I have the following package:
CREATE OR REPLACE PACKAGE "BACKUP"."PKG_BACKUP"
IS
PROCEDURE BACKUP_TABLE (TABLE_NAME IN VARCHAR);
END PKG_BACKUP;
CREATE OR REPLACE PACKAGE BODY "BACKUP"."PKG_BACKUP"
IS
PROCEDURE BACKUP_TABLE (TABLE_NAME IN VARCHAR) IS
MYDATE VARCHAR(10);
BEGIN
MYDATE := to_char(sysdate,'YYYYMMDD');
DBMS_OUTPUT.PUT_LINE(' Backing up '||TABLE_NAME||' table...');
EXECUTE IMMEDIATE 'CREATE TABLE "BACKUP"."'||TABLE_NAME||'_'||MYDATE||'" AS SELECT * FROM "MYSCHEMA"."'||TABLE_NAME||'" COMPRESSED';
END backup_table;
END "PKG_BACKUP";
/However, every time I execute it I get the following error:
SQL> exec BACKUP.PKG_BACKUP.BACKUP_TABLE('POOL');
** Backing up POOL table...*
BEGIN BACKUP.PKG_BACKUP.BACKUP_TABLE('POOL'); END;
ERROR at line 1:
ORA-00942: table or view does not exist
*ORA-06512: at "BACKUP.PKG_BACKUP
", line 9*
*ORA-06512: at line 1*
Table does exist and user executing the statement has the proper privileges (i've even executed the contents of "execute immediate" by hand and it works fine)
What am I missing?
Thanks in advance.

Answer 1

SQL> CREATE OR REPLACE PACKAGE pkg_backup AUTHID CURRENT_USER
  2  IS
  3     PROCEDURE backup_table (table_name IN VARCHAR);
  4  END pkg_backup;
  5  /
Package created.
SQL> CREATE OR REPLACE PACKAGE BODY PKG_BACKUP
  2  IS
  3     PROCEDURE backup_table (table_name IN VARCHAR)
  4     IS
  5        mydate   VARCHAR (10);
  6     BEGIN
  7        mydate := TO_CHAR (SYSDATE, 'YYYYMMDD');
  8        DBMS_OUTPUT.put_line (' Backing up ' || table_name || ' table...');
  9 
10        EXECUTE IMMEDIATE 'CREATE TABLE BACKUP'||table_name||'_'||mydate||' AS SELECT * FROM '|| table_name || ' COMPRESSED';
11     END backup_table;
12  END PKG_BACKUP;
13  /
Package body created.
SQL> EXEC PKG_BACKUP.backup_table('EMP');
Backing up EMP table...
PL/SQL procedure successfully completed.
SQL> SELECT * FROM BACKUPEMP_20090130;
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
      7369 SMITH      CLERK           7902 17-DEC-80        800                    20
      7499 ALLEN      SALESMAN        7698 20-FEB-81       1600        300         30
      7521 WARD       SALESMAN        7698 22-FEB-81       1250        500         30
      7566 JONES      MANAGER         7839 02-APR-81       2975                    20
      7654 MARTIN     SALESMAN        7698 28-SEP-81       1250       1400         30
      7698 BLAKE      MANAGER         7839 01-MAY-81       2850                    30
      7782 CLARK      MANAGER         7839 09-JUN-81       2450                    10
      7788 SCOTT      ANALYST         7566 09-DEC-82       3000                    20
      7839 KING       PRESIDENT            17-NOV-81       5000                    10
      7844 TURNER     SALESMAN        7698 08-SEP-81       1500          0         30
      7876 ADAMS      CLERK           7788 12-JAN-83       1100                    20
      7900 JAMES      CLERK           7698 03-DEC-81        950                    30
      7902 FORD       ANALYST         7566 03-DEC-81       3000                    20
      7934 MILLER     CLERK           7782 23-JAN-82       1300                    10
14 rows selected.Edited by: user10594152 on Jan 30, 2009 5:18 PM
Edited by: user10594152 on Jan 30, 2009 5:19 PM