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I need to list all of the subject's "neptuncode", "subjectname" and "examdate" ordered by subjectname.

But if someone enrols the subject for the first time, I have to list (recommend them) examdate(s).

I tried this code:

SELECT neptuncode, subjectname, examdate
FROM enrollments, subjects
WHERE enrollments.student = (SELECT students.student_id FROM students)
AND enrollments.firstenroll = 1
ORDER BY subjectname;

but it didn't work.

I attach my tables here:

enter image description here

  • 3
    Please update your question with actual table definitions in the form of DDL, sample data in the form of actual insert statements and your expected results from your query. – Scott Hodgin Nov 6 at 21:28

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