Oracle Julian day of year

问题

how can I select Julian day of year in Oracle database?

I tried: select to_char(sysdate, 'J') from dual; Which gives me the number of days since January 1, 4712 BC. But I would need the number of days since 1.1. of current year.

回答1:

If you check the TO_CHAR (datetime) documentation you get a link to "Format Models" with a comprehensive list of available formats. I guess you want this:

DDD Day of year (1-366)

回答2:

SELECT TO_CHAR(SYSDATE, 'DDD') from DUAL;

回答3:

One way would be to use:

select sysdate - trunc(sysdate,'yyyy') from dual

'Trunc' cuts everything except the year and returns 01/01/2014, subtracted by the sysdate returns numbers of days since 1st of january.

回答4:

Use sql select trunc(sysdate)+1 - trunc(sysdate,'yyyy') from dual. you will get an even number

来源：https://stackoverflow.com/questions/24775362/oracle-julian-day-of-year