format code may not appear in the format of the date - IW related

Hello

Please explain what I'm doing wrong:
SQL>  select to_char(sysdate, 'YYYY-IW') from  dual;

TO_CHAR
-------
2010-48

SQL>  select to_date('2010-22', 'YYYY-IW') from  dual;
 select to_date('2010-22', 'YYYY-IW') from  dual
                           *
ERROR at line 1:
ORA-01820: format code cannot appear in date input format
Oracle 9.2.
Kind regards.
Greg

First of all, you should stay with the date format. Instead of converting it to a string, you could TRUNCATE until the first day of the Iso-Wekk.

And to allow the use of the index that you just have to put a certain range on your queries.

example of

select *
from t
where col_date  >= trunc(sysdate, 'IW')  ;

If col_date can contain values greater than System. Or if you use another value date to compare as sysdate. Next, you need to compare with a range. Just like that

select *
from t
where col_date  >= trunc(sysdate, 'IW')
and col_date  < trunc(sysdate, 'IW')+7 ;

If you want to enter a certain WEEK and get all entries this week, you can start with the first day of the iso year and add the number of weeks.

example of using iso-week 40

select *
from t
where col_date  >= trunc(sysdate, 'IYYY')  + 7 * 40
and col_date  < trunc(sysdate, 'IYYY')+7 * (40 +  1);

However the arithmetic calendar is complex. Be careful for special cases. For example, the beginning of the ISO year 2011 is January 3, 2011. So, if we organize this logic on the first or second of January * 2011 * we would get the week civil 40 of * 2010 *. It's probably not what you want.

To account for this, we must ensure that we use the correct year. There are several possibilities how do. In this case, I choose to use the normal TRUNK for the first day of the normal year (1.1.2011) then add a week and truncate again.

example of

select *
from t
where col_date  >= trunc(trunc(sysdate,'YYYY)+7, 'IYYY')  + 7 * 40
and col_date  < trunc(trunc(sysdate,'YYYY)+7, 'IYYY')+7 * (40 +  1);

Published by: Sven w. on December 3, 2010 08:52

Tags: Database

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