The relational data model was first described in a paper by Dr. E. F. Codd in ____.
A) 1965
B) 1970
C) 1975
D) 1980
E) 1985
Correct Answer:
Verified
Q5: An attribute or combination of attributes that
Q6: The primary key of the relation added
Q7: All of the following are true about
Q8: The values of the primary key of
Q9: A foreign key _.
A) must have the
Q11: In relational database, the basic data structure
Q12: An attribute(s) that acts as a foreign
Q13: Storing a binary many-to-many relationship in a
Q14: Doctors and patients are in a binary
Q15: An attribute(s) that functions as the primary
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