Next weeks ISO weeks and date

Question

Hello I have a few tables on 9i with weekly partitions.
Currently the data are loaded in partition P2010W45, where W45 is the ISO Week
e.g.
PARTITION_NAME HIGH_VALUE
P2009W43 TO_DATE(' 2009-11-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN')
P2009W44 TO_DATE(' 2009-11-08 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN')
P2009W45 TO_DATE(' 2009-11-15 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN')
I need a script to run every MONDAY to create the query to create the partitions every week.
So the next partition will be create with the below:
SELECT 'ALTER TABLE '||'TEST_TABLE'||' 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 DUAL;
Please suggest if the above will produce a correct output, especially when we will enter the new year,
or suggest a better way to do it.
Thank you in advance

Answer 1

You can verify your logic with a simple test script:
with t as (
select trunc(sysdate+(7*level),'IW') as dt from dual connect by level <= 100
select dt, to_char(dt,'Dy'), 
'ALTER TABLE '||'TEST_TABLE'||' ADD PARTITION '||' P'||
TO_CHAR(TRUNC(dt+7), 'IYYY')||'W'||
TO_CHAR(TRUNC(dt+7), 'IW')||' VALUES LESS THAN(TO_DATE('''||
TO_CHAR(dt + 14, 'YYYYMMDD')||''',''yyyymmdd''));' as alter_command
from t order by dt
;Run it out for several years if necessary and check the results.
Regards,
Bob