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oleander/gist:1846659

Created February 16, 2012 17:39
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gistfile1.sql
SELECT
courses_courses.pre_req_course, COUNT(*)
FROM
courses_courses
WHERE
NOT EXISTS (
SELECT
completed.course
FROM
completed
WHERE
courses_courses.pre_req_course = completed.course
)
GROUP BY courses_courses.pre_req_course
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