interval + "1" [year | month | day] does not take into account leap years?
Hi allThe Version of database: Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bi
Database version: PL/SQL Release 10.2.0.5.0 - Production
I just realized that the function of the interval is not account of leap years.
SQL> select to_date('29-02-2008','dd-mm-yyyy') + interval '1' year
2 from dual;
select to_date('29-02-2008','dd-mm-yyyy') + interval '1' year
*
ERROR at line 1:
ORA-01839: date not valid for month specified
I looked through the documentation as much as I can and could find no mention of this.If I want to add a year to date, I have to calculate the number of days or do something like incrementing only the part of the year and then manually check that it does not fall on February 29 if it is not a leap year manually?
Edit:
just to clarify, day and minute seem to work for example but do not have month and year:
SQL> select to_date('28-02-2009','dd-mm-yyyy') + interval '1' day
2 from dual;
TO_DATE('
---------
01/MAR/09
1 row selected.
Elapsed: 00:00:00.00
SQL>
SQL> select to_date('28-02-2009 23:59','dd-mm-yyyy hh24:mi') + interval '1' minute
2 from dual;
TO_DATE('
---------
01/MAR/09
1 row selected.
Elapsed: 00:00:00.00
SQL>
SQL> select to_date('29-01-2009','dd-mm-yyyy') + interval '1' month
2 from dual;
select to_date('29-01-2009','dd-mm-yyyy') + interval '1' month
*
ERROR at line 1:
ORA-01839: date not valid for month specified
Elapsed: 00:00:00.00
SQL>
SQL> select to_date('29-02-2008','dd-mm-yyyy') + interval '1' year
2 from dual;
select to_date('29-02-2008','dd-mm-yyyy') + interval '1' year
*
ERROR at line 1:
ORA-01839: date not valid for month specified
Published by: WhiteHat on July 14, 2011 10:31
Hello
It is true; in the INTERVAL arithmetic + x (or) d - x, where x is the months or years, the result will be the same day of the month as d. If this date does not exist, then you will get an error
Another example is:
SQL> SELECT DATE '2011-03-31' + INTERVAL '1' MONTH FROM dual;
SELECT DATE '2011-03-31' + INTERVAL '1' MONTH FROM dual
*
ERROR at line 1:
ORA-01839: date not valid for month specified
To avoid triggering an error, use ADD_MONTHS and/or arithmetic DATE instead.
Tags: Database
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