We expect the constraint an instructor cannot teach sections in two different classrooms in a semester in

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We expect the constraint “an instructor cannot teach sections in two different classrooms in a semester in the same time slot” to hold.

a. Write an SQL query that returns all (instructor, section) combinations that violate this constraint.

b. Write an SQL assertion to enforce this constraint (as discussed in Section 4.4.8, current generation database systems do not support such assertions, although they are part of the SQL standard).

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Database System Concepts

ISBN: 9780078022159

7th Edition

Authors: Abraham Silberschatz, Henry F. Korth, S. Sudarshan

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Question Posted: Jun 13, 2022 05:06 AM

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We expect the constraint an instructor cannot teach sections in two different classrooms in a semester in

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a SELECT DISTINCT instructor section FROM teaches WHERE EXISTS SELECT FROM teaches AS t1 WHERE t1...View the full answer

Database System Concepts

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