Rewrite the preceding query, but also ensure that you include only instructors who have given at least
Question:
Rewrite the preceding query, but also ensure that you include only instructors who have given at least one other non-null grade in some course.
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select distinctinstructorID instructorname from instructor teaches takes where instructorIDteachesID ...View the full answer
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Related Book For 
Database System Concepts
ISBN: 9780078022159
7th Edition
Authors: Abraham Silberschatz, Henry F. Korth, S. Sudarshan
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