All we need is an easy explanation of the problem, so here it is.
I have a table LoanDeadline that has a column called deadline, it’s simple text and not Date and it’s in the format of
July 25, 2014
How do I compare this with sysdate ?
So far I have
SELECT 'YOUR LOAN IS APPROVED' FROM LOANDEADLINE LD WHERE SYSDATE < LD.DEADLINE;
But this doesnt work because my SYSDATE and LD.DEADLINE are different data types.
How to solve :
I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.
WHERE SYSDATE < to_date( LD.DEADLINE, 'Month DD, YYYY' );
would work assuming all your data is perfect and that all your session are configured to use English month names. I would strongly recommend, however, that you fix the data model. Storing strings that represent dates rather than actual dates is a terrible practice. Inevitably, you end up with at least a handful of columns where the data is invalid which would cause this query to fail. You could work around that by creating a function that attempts to convert the string to a date and catches the exception if there is an error and then use that function in your query, i.e.
CREATE OR REPLACE FUNCTION my_to_date( p_str IN VARCHAR2, p_format IN VARCHAR2 ) RETURN date IS BEGIN RETURN to_date( p_str, p_format ); EXCEPTION WHEN others THEN RETURN NULL; END;
WHERE SYSDATE < my_to_date( LD.DEADLINE, 'Month DD, YYYY' );
Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂