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Amitai Blickstein6,863 Points
I checked my answer by hand, it is correct! What did I do wrong?
There are 11 female customers, 2,3,7,9,11,14,16,21,23,24,26, which is precisely what my code returns.
This is my code:
SELECT * FROM Sale AS s INNER JOIN ( SELECT * FROM customer WHERE gender = 'F' ) as fem ON s.customerID = fem.customerID ORDER BY customerID;
Steven Parker221,292 Points
Your sub-query doesn't need to select all columns, it only needs to select the CustomerID.
That way, only the columns from the Sale table will be shown (as the instructions asked) instead off all columns from both tables.