Assignment2, PL-SQL Programming

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How do I display usernames for students from a student table, assigning each student a username initials001 (initials is the actual student initials), and if the students initials are the same as another students, then I am to use the username initials002.

Next question: How do i display how many A''s, B''s,C''s, D''s are in a table named course_grade?

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