Oracle Julian day of year

扶醉桌前 提交于 2019-12-23 07:48:18

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

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