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Databases

Jan Lundeen
Jan Lundeen
5,882 Points
Posted by Jan Lundeen
Jan Lundeen
5,882 Points

SQL Stage 4: Practice Problems: Find all loans that are overdue - not sure if my query is right.

Hi,

In Reporting for SQL, I was working on the section "SQL Stage 4: Practice Problems". In particular, I was trying to find all loans that are overdue. Here's my query:

SELECT * FROM loans where returned_on BETWEEN DATE('NOW',"- 2 days") AND DATE('now',"+2 days") AND returned_on IS null;

However, I'm not sure that it's correct since I got "Query returned no results". I looked at the table and no books are overdue. I would think I'd get zero, but I'm not sure. Any ideas?

Thanks,

Jan

Vittorio Somaschini
Vittorio Somaschini
33,371 Points
Vittorio Somaschini
Vittorio Somaschini
33,371 Points

Hello Jan.

I have edited your question to follow the guidelines for pasting the code on the forum: https://teamtreehouse.com/forum/posting-code-to-the-forum

;)

Jan Lundeen
Jan Lundeen
5,882 Points
Jan Lundeen
Jan Lundeen
5,882 Points

Hi Vittorio,

I'm not sure exactly what you did. I looked in the link to the forum, but I can't find any non-compliant code. Can you help me out with this?

Thanks,

Jan

2 Answers

Unsubscribed User
Unsubscribed User
16,600 Points

Your query can never return results because you're asking for records where returned_on is between two dates and where return_on IS NULL; you can't do both.

You probably meant for the dates to be the return_by field, but you really only need that to be greater than NOW.

SELECT * FROM loans WHERE return_by < DATE('now') AND returned_on IS null;
Jan Lundeen
Jan Lundeen
5,882 Points
Jan Lundeen
Jan Lundeen
5,882 Points

Your rignt Ian. Thanks!

Jan