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SQL Programming Manual for TAL

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Enforcing Data Integrity
HP NonStop SQL Programming Manual for TAL—527887-001
E-4
Managing Referential Integrity
The query returns this result:
CLASSNUM CLASS_COURSE
-------- ------------
--- 0 row(s) selected.
The result of zero rows selected indicates that each class points to a valid course. The
result does not prove that the class points to the correct course.