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What is wrong with this query?

According to the grader, my query is not returning all sales to people with Gender = "F". My results are returning the same exact results as the previous question which asks for the same results. I'm thinking this may be a bug in the grader.

Question 4 of https://teamtreehouse.com/library/querying-relational-databases/subqueries/subqueries

The app doesn't seem to allow linking directly to question 4, sorry.

The query is:

select Sale.* from Sale inner join (select * from Customer where Gender = 'F') as fc on Sale.CustomerID = fc.CustomerID;

2 Answers

Steven Parker
Steven Parker
230,248 Points

Try having your subquery return only the CusomerID's.

In practice, what you did should also work but it appears that the checker pre-tests the subquery directly.

Steven Parker Thanks, that did the trick. I guess only returning the CustomerID in the subquery is more efficient anyway.

select * from Sale inner join (select CustomerID from Customer where Gender = 'F') as fc on Sale.CustomerID = fc.CustomerID;