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
Kate Woodroffe
Courses Plus Student 6,685 PointsStuck on task 4 of querying relational databases, sub queries assessment
I'm stuck on task 4 of the subquery section of querying relational databases. I have input the code code and I feel like it's right (I've tested equivalent code in SQL playground with the library tables). What is wrong?
The question is:
In a car database there is a Sale table with columns, SaleID, CarID, CustomerID, LocationID, SalesRepID, SaleAmount and SaleDate and a Customer table with columns, CustomerID, FirstName, LastName, Gender and SSN. Use a subquery as a derived table to show all sales to female ('F') customers. Select all columns from the Sale table only.
My answer is
select s.saleid,s.carid,s.customerid,s.locationid,s.salesrepid,s.saleamount,s.saledate from sale s inner join (select customerid from customer where gender = 'F') c on s.customerid = c.customerid;
4 Answers
Steven Parker
240,995 PointsYou're very close! But when they say "show all sales", they mean all columns ("SELECT *") from the sales. Just use the wildcard instead of naming individual columns and you'll pass.
Kate Woodroffe
Courses Plus Student 6,685 PointsThank you. I thought I'd tried that but must have tried s.* instead.
Carolyn Yon
2,705 PointsWow...I had this same issue. The course does not seem to be consistent because when it used the language "show all sales" in a previous exercise, I used the individual column names and it passed. Then in an earlier module when it said "show all..." and I used the "*", it wouldn't pass. Thanks for the post though!
Josh Gabel
18,414 PointsI had this same issue. The Challenge text specifically says
Select all columns from the Sale table only.
Someone should adjust the challenge text to reflect the query result the challenge is actually looking for.
Steven Parker
240,995 PointsYou might want to report that as a bug directly to the staff as described on the Support page.
Josh Gabel
18,414 PointsThanks Steven, I just did that.
Kate Woodroffe
Courses Plus Student 6,685 PointsKate Woodroffe
Courses Plus Student 6,685 PointsThe error received was
Bummer: Your query didn't return all columns from the Sale table for who's CustomerIDs belong to people who identify as female!