Question: What does the following code do in SQL? SELECT DISTINCT course_id FROM Section WHERE semester = Fall AND year = 2017 AND course_id NOT IN

What does the following code do in SQL?

SELECT DISTINCT course_id

FROM Section

WHERE semester = Fall AND year = 2017 AND course_id NOT IN

(

SELECT course_id

FROM Section

WHERE semester = Spring AND year = 2017

);

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