What are BCNF and 3NF? How to decompose a relation into BCNF? How to decompose a relation into 3NF?
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What are BCNF and 3NF? How to decompose a relation into BCNF? How to decompose a relation into 3NF?
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- aaa A d N R bbb B N S CCC W Convert the above ER diagram to relations in the normal manner, and then identify which of the following is a relation schema. OA. T(aaa, bbb.ccc) O B.S(bbb, ccc) O C.A(aaa, d) O D.R(aaa, bbb)Primary key identifies a unique tuple of a relation, true or false?(a) What are the significant functional dependencies in this relation? (b) What is/are the candidate key(s) of this relation? (c) is this relation in 1NF, 2NF, 3NF, BCNF? And why?
- ID name Courses M semester Teaches N ID name Professors Convert the above ER diagram to relations in the normal manner, and then identify which of the following is a relation schema. O A. Courses (ID, Name) O B. Teaches (ID, ID, semester) OC. Professors(ID, name, semester) O D. Teaches (ID, semester)What are three advantages of using a surrogate key rather than the main key to access a relation instead?Normalize following relation up to 3NF: Bank(acno, cust_name, ac_type, bal, int_rate, cust_city, branchId, branch_nm, br_city)
- What are three signs that a surrogate key should be generated for the primary key of a relation instead of using the main key?What are three criteria that indicate that a surrogate key for a relation's main key should be created?The use of composite attributes are avoided in relation schema when the relation schema conforms to –(a) 1NF(b) BCNF(c) 3NF(d) 4NF