Welcome to the Treehouse Community
Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.
Start your free trial
Grant Whiting
3,645 PointsQuestion 4 asks me to get a list of all Female customers but I'm told this query doesn't do it:
SELECT s.* FROM Sale AS s INNER JOIN ( SELECT CustomerID FROM Customer WHERE Gender = 'F' ) AS FemaleCustomer ON FemaleCustomer.CustomerID = s.CustomerID;
2 Answers
Travis Alstrand
Treehouse Project ReviewerHi Grant Whiting 👋
Your SQL statement definitely looks valid. I think this is another situation where the back end of this challenge is looking for something specific, or is getting mad with extra things added. In this case, I believe the alias added to all the Sales is what's throwing it off.
This worked for me
SELECT *
FROM Sale
INNER JOIN (SELECT CustomerID FROM Customer WHERE Gender = 'F') AS FemaleCustomers
ON Sale.CustomerID = FemaleCustomers.CustomerID;
Grant Whiting
3,645 PointsOk great, thanks. Looks like the Sale table alias was the issue.
Travis Alstrand
Treehouse Project ReviewerAgreed. You're welcome though! Nice work!!