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Noah Fields13,985 Points
My version of the answer with subqueries
Here's my version of the code, using subqueries.
-- Generate a schedule for Rex Rios.
SELECT NAME AS Class, PERIOD_ID AS Period FROM SCHEDULE
INNER JOIN (CLASSES) ON CLASSES.ID = CLASS_ID --Find classes where the class ID in classes = schedule ID
INNER JOIN SUBJECTS ON CLASSES.SUBJECT_ID = SUBJECTS.ID -- Join to subjects where the classes subject ID = Subject ID
WHERE STUDENT_ID IN (
SELECT ID FROM STUDENTS
WHERE FIRST_NAME = 'Rex' AND LAST_NAME = 'Rios' --But only for those where the schedule's ID colum matches Rex's ID
ORDER BY PERIOD_ID --Order by period for neatness