example of not exists in sqlexample use of not
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 sqlexample use of not existscreate assertion mustbeenrolledtotakeexamalternative1check not exists select studentid
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example of alternative formulation as a table constraintexample alternative formulation as a table constraintalter table exammarkadd constraint
example of not exists operator - sqlexample is a translation into sql of the corresponding example which is included there merely to show that for
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