Example of not exists in sql, PL-SQL Programming

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Example of NOT EXISTS in SQL

Example: Use of NOT EXISTS

CREATE ASSERTION Must_be_enrolled_to_take_exam_alternative1

CHECK (

NOT EXISTS (SELECT StudentId, CourseId

FROM EXAM_MARK

EXCEPT

SELECT StudentId, CourseId

FROM IS_ENROLLED_ON));

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Example of NOT EXISTS in SQL Example: Use of NOT EXISTS CREATE ASSERTION Must_be_enrolled_to_take_exam_alternative1 CHECK ( NOT EXISTS (SELECT StudentId, CourseId

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