Running a query generated by a query

Question

Hello,
I have the following query in 9i that will generate the add partitions queries for my tables.
Since I want to use it in a cron script, please suggest a way that I can run the queries generated from this script.
SELECT 'ALTER TABLE '||
table_name||
' ADD PARTITION '||
'P'||
TO_CHAR(TRUNC(sysdate+7), 'IYYY')||
'W'||
TO_CHAR(TRUNC(sysdate+7), 'IW')||
' VALUES LESS THAN(TO_DATE('''||
TO_CHAR(sysdate + 14, 'YYYYMMDD')||
''',''YYYYMMDD''));'
FROM user_tab_partitions
WHERE partition_name = (
SELECT 'P'||
TO_CHAR(TRUNC(SYSDATE), 'IYYY')||
'W'||
TO_CHAR(TRUNC(SYSDATE), 'IW')
FROM DUAL
AND table_name NOT IN
SELECT table_name
FROM user_tab_partitions
WHERE partition_name = (
SELECT 'P'||
TO_CHAR(TRUNC(sysdate+7), 'IYYY')||
'W'||
TO_CHAR(TRUNC(sysdate+7), 'IW')
FROM DUAL));
Thank you

Answer 1

Use dynamic SQL:
DECLARE
    stmt VARCHAR2(32767);
BEGIN
    SELECT  'ALTER TABLE '||
            table_name||
            ' ADD PARTITION '||
            'P'||
            TO_CHAR(TRUNC(sysdate+7), 'IYYY')||
            'W'||
            TO_CHAR(TRUNC(sysdate+7), 'IW')||
            ' VALUES LESS THAN(TO_DATE('''||
            TO_CHAR(sysdate + 14, 'YYYYMMDD')||
            ''',''YYYYMMDD''))' -- note no semi-colon
      INTO  stmt
      FROM  user_tab_partitions
      WHERE partition_name = (
                              SELECT  'P'||
                                      TO_CHAR(TRUNC(SYSDATE), 'IYYY')||
                                      'W'||
                                      TO_CHAR(TRUNC(SYSDATE), 'IW')
                                FROM  DUAL
        AND table_name NOT IN (
                               SELECT  table_name
                                 FROM  user_tab_partitions
                                 WHERE partition_name = (
                                                         SELECT  'P'||
                                                                 TO_CHAR(TRUNC(sysdate+7), 'IYYY')||
                                                                 'W'||
                                                                 TO_CHAR(TRUNC(sysdate+7), 'IW')
                                                           FROM  DUAL
    EXECUTE IMMEDIATE stmt;
END;
/SY.