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Assume that, in the suppliers relation above, each supplier and each street within a city has a unique name, arid (sn.ame, city) forms of candidate key. No other functional dependencies are implied other than those implied by primary and candidate keys. Which one of the following is TRUE about the above schema?
(A) The schema is in BCNF (B) The schema is in 3NF but not in BCNF
(C) The schema is in 2NF but not in 3NF (D) The schema is not in 2NF

By the term “concise code’ we understand that the code
(A) conveys information on item being coded
(B) is of small length
(C) can add new item easily
(D) includes all relevant characteristics of item being coded

Relations are used in logical database design because:
(I) sound theory of relations facilitates systematic design of relational databases
(ii) they kre very popular
(iii) they are flat files and easy to store and retrieve from computer’s memory
(iv) E-R diagrams allow design of relations
(A)iandii (B)iundiii
(C) ii and iii (D)iii andiv

The columns of tables arc reffs erred:
(A) schema (B) domain ‘4
(C) attribute (D) tuple

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