将日期MM / DD / YYYY转换为七位数

Question

I have the data like:

Completed Date       <\t>    Date<br>
02/12/2014           <\t>       2456701<br>
02/20/2014    <\t>              2456709

I found the way to convert a Date to Completed Date : TO_DATE(Date,'J')
I would like to convert a Completed Date into a Date using oracle DB function. Help me please.

Answer 1

You just need to do the vice-versa, TO_DATE and TO_CHAR .

To convert Julian days to DATE :

SQL> SELECT to_date(2457122, 'J') dt FROM dual;

DT
---------
09-APR-15

To convert DATE into Julian days :

SQL> SELECT to_char(SYSDATE, 'J') dt FROM dual;

DT
-------
2457122