Oracle Date Formatting Null date as 00/00/0000

问题

How can I format the Null Dates in my Oracle SQL to 00/00/0000. I am using NVL function but it doesn't recognize the 00/00/0000 as the date format.

Is there any Date Formatting available in Oracle SQL which formats null date to 00/00/0000

回答1:

Do the to_char first and wrap it in the NVL. For example,

select nvl(to_char(null, 'DD-MM-YYYY'), '00-00-0000') from dual

回答2:

Use this function to assign default values of null values of date:

SELECT id, NVL(start_date, to_date('20020101','YYYYMMDD')) FROM employee;

来源：https://stackoverflow.com/questions/4586014/oracle-date-formatting-null-date-as-00-00-0000