Comments on: how to get monday=1, tuesday=2… http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html Oracle Certified Master Mon, 06 Oct 2008 22:24:35 +0000 http://wordpress.org/?v=2.0.5 by: Laurent Schneider http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html#comment-6002 Thu, 21 Feb 2008 17:20:58 +0000 http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html#comment-6002 sure thing :) sure thing :)

]]> by: Brian Tkatch http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html#comment-6001 Thu, 21 Feb 2008 17:18:43 +0000 http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html#comment-6001 Thanx for the explanation Laurent. I check your blog a lot, so keep on blogging! :) Thanx for the explanation Laurent.

I check your blog a lot, so keep on blogging! :)

]]> by: Laurent Schneider http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html#comment-6000 Thu, 21 Feb 2008 16:05:43 +0000 http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html#comment-6000 next_day is also session dependent. having a session dependent statement is way more uncomfortable. 1) you cannot use it in materialized view 2) you cannot use it in function based index 3) you cannot have different behavior within the same statement, like displaying the default local currency, the American day of week, and the swiss short time TS (I am quite busy those days while writing about it in my book About Dy, just to make you worry, it may changed as in changed in French from 9.2.0.8 to 10.1.0.5 from 2 chars to 4 chars abbreviation (imagine the hassle if it were hard coded in your program!) :twisted: Well, I never use NEXT_DAY as a large number of my customers do have different locale settings. However I admit that if you never used and will never anything than american_america, then why bother, go for NEXT_DAY 8-) next_day is also session dependent. having a session dependent statement is way more uncomfortable.
1) you cannot use it in materialized view
2) you cannot use it in function based index
3) you cannot have different behavior within the same statement, like displaying the default local currency, the American day of week, and the swiss short time TS (I am quite busy those days while writing about it in my book

About Dy, just to make you worry, it may changed as in changed in French from 9.2.0.8 to 10.1.0.5 from 2 chars to 4 chars abbreviation (imagine the hassle if it were hard coded in your program!) :twisted:

Well, I never use NEXT_DAY as a large number of my customers do have different locale settings. However I admit that if you never used and will never anything than american_america, then why bother, go for NEXT_DAY 8-)

]]> by: Brian Tkatch http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html#comment-5999 Thu, 21 Feb 2008 15:41:31 +0000 http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html#comment-5999 Ah, now i see what you did. *slaps self on head* I could change the D to Dy, but its jsut a tradeoff of the more clear choice of using CASE/DECODE to choose the day, or to add the required amount of days. Personally, i think NEXT_DAY is a lot quite clearer. Ah, now i see what you did. *slaps self on head*

I could change the D to Dy, but its jsut a tradeoff of the more clear choice of using CASE/DECODE to choose the day, or to add the required amount of days. Personally, i think NEXT_DAY is a lot quite clearer.

]]> by: Laurent Schneider http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html#comment-5998 Thu, 21 Feb 2008 14:12:53 +0000 http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html#comment-5998 this is all the point about using the post... Do not use 'D' ! Unfortunately you have no NLS_DATE_TERRITORY, therefore you cannot do something like select to_char(sysdate,'D', 'nls_date_territory=switzerland'), to_char(sysdate,'DL','nls_date_territory=america') from dual; it is simply impossible. But be patient, I have raised an enhancement request 4 years ago <a href="https://metalink.oracle.com/metalink/plsql/ml2_documents.showFrameDocument?p_database_id=BUG&p_id=3769415" rel="nofollow">bug 3769415</a> this is all the point about using the post… Do not use ‘D’ !

Unfortunately you have no NLS_DATE_TERRITORY, therefore you cannot do something like

select to_char(sysdate,’D', ‘nls_date_territory=switzerland’), to_char(sysdate,’DL’,'nls_date_territory=america’) from dual;

it is simply impossible. But be patient, I have raised an enhancement request 4 years ago
bug 3769415

]]> by: Brian Tkatch http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html#comment-5997 Thu, 21 Feb 2008 14:03:16 +0000 http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html#comment-5997 For the month passing: SELECT CASE WHEN TO_CHAR(A, 'D') IN (7, 1) THEN NEXT_DAY(A, 2) ELSE A END FROM (SELECT TRUNC(ADD_MONTHS(SysDate, +1), 'MM') A FROM Dual); Of course, the country's specifics require manual intervention. :) For the month passing:

SELECT
CASE
WHEN TO_CHAR(A, ‘D’) IN (7, 1) THEN NEXT_DAY(A, 2)
ELSE A
END
FROM
(SELECT TRUNC(ADD_MONTHS(SysDate, +1), ‘MM’) A FROM Dual);

Of course, the country’s specifics require manual intervention. :)

]]> by: Gary http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html#comment-5991 Wed, 20 Feb 2008 22:19:59 +0000 http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html#comment-5991 Interestingly, there's a difference in the way "numeric date language" and the "D" format handle territory. > alter session set nls_territory='America'; Session altered. > select to_char(sysdate,'DAY','NLS_DATE_LANGUAGE=''numeric date language'''), 2 to_char(sysdate,'DAY D') from dual; T TO_CHAR(SYS - ----------- 4 THURSDAY 5 > alter session set nls_territory='Australia'; Session altered. > select to_char(sysdate,'DAY','NLS_DATE_LANGUAGE=''numeric date language'''), 2 to_char(sysdate,'DAY D') from dual; T TO_CHAR(SYS - ----------- 4 THURSDAY 4 Interestingly, there’s a difference in the way “numeric date language” and the “D” format handle territory.

> alter session set nls_territory=’America’;

Session altered.

> select to_char(sysdate,’DAY’,'NLS_DATE_LANGUAGE='’numeric date language”’),
2 to_char(sysdate,’DAY D’) from dual;
T TO_CHAR(SYS
- ———–
4 THURSDAY 5

> alter session set nls_territory=’Australia’;

Session altered.

> select to_char(sysdate,’DAY’,'NLS_DATE_LANGUAGE='’numeric date language”’),
2 to_char(sysdate,’DAY D’) from dual;
T TO_CHAR(SYS
- ———–
4 THURSDAY 4

]]> by: Laurent Schneider http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html#comment-5990 Wed, 20 Feb 2008 21:31:26 +0000 http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html#comment-5990 try to upgrade to a supported release of Oracle 8) the formatting is not necessary select trunc(sysdate,'mm')+decode(TO_CHAR(TRUNC(sysdate,'mm'),'DY','NLS_DATE_LANGUAGE=AMERICAN'),'SAT',2,'SUN',1,0) from dual; try to upgrade to a supported release of Oracle 8)

the formatting is not necessary

select trunc(sysdate,’mm’)+decode(TO_CHAR(TRUNC(sysdate,’mm’),’DY’,'NLS_DATE_LANGUAGE=AMERICAN’),’SAT’,2,’SUN’,1,0) from dual;

]]> by: Eugene http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html#comment-5989 Wed, 20 Feb 2008 21:27:57 +0000 http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html#comment-5989 Laurent, Thanks for reply, but ... SQL> select to_char(trunc(sysdate,'mm') + decode(TO_CHAR(TRUNC(sysdate,'MM'),'DY','NLS_DATE_LANGUAGE =AMERICAN'),'SAT',2,'SUN',1,0),'DL') from dual; select to_char(trunc(sysdate,'mm') + decode(TO_CHAR(TRUNC(sysdate,'MM'),'DY','NLS_DATE_LANGUAGE=AMER ERROR at line 1: ORA-01821: date format not recognized Eugene Laurent,
Thanks for reply, but …
SQL> select to_char(trunc(sysdate,’mm’) + decode(TO_CHAR(TRUNC(sysdate,’MM’),’DY’,'NLS_DATE_LANGUAGE
=AMERICAN’),’SAT’,2,’SUN’,1,0),’DL’) from dual;
select to_char(trunc(sysdate,’mm’) + decode(TO_CHAR(TRUNC(sysdate,’MM’),’DY’,'NLS_DATE_LANGUAGE=AMER

ERROR at line 1:
ORA-01821: date format not recognized

Eugene

]]> by: Laurent Schneider http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html#comment-5987 Wed, 20 Feb 2008 19:45:13 +0000 http://laurentschneider.com/wordpress/2008/02/how-to-get-monday1-tuesday2.html#comment-5987 select to_char(trunc(sysdate,'mm')+decode(TO_CHAR(TRUNC(sysdate,'MM'),'DY','NLS_DATE_LANGUAGE=AMERICAN'),'SAT',2,'SUN',1,0),'DL') from dual; TO_CHAR(TRUNC(SYSDATE,'MM')+D ----------------------------- Friday, February 01, 2008 select to_char(trunc(sysdate,’mm’)+decode(TO_CHAR(TRUNC(sysdate,’MM’),’DY’,'NLS_DATE_LANGUAGE=AMERICAN’),’SAT’,2,’SUN’,1,0),’DL’) from dual;
TO_CHAR(TRUNC(SYSDATE,’MM’)+D
—————————–
Friday, February 01, 2008

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