CIW 1D0-541 Question Answer
Consider the following relation definition:
STUDENT(
Student_Number: integer NOT NULL
Name: variable length character string length 20 NOT NULL)
Primary Key Student_Number
HOUSING(
Housing_ID: integer NOT NULL
Student_Number: integer NOT NULL
Building: variable length character string length 25 NOT NULL)
Primary Key Housing_ID
Foreign Key Student_Number References
STUDENT(Student_Number)
ON DELETE NO CHECK
ON UPDATE
Which integrity constraint is violated in this relation definition?
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