SE305 Database System Technology

25/09/2014Quiz-1

1. Which information is NOT contained in Data dictionary?

a) Database schemab) Integrity constraintsc) Authorization informationd) Index

2. Which level of abstraction does describe how a record is stored?

a) Physical Levelb) Logical Levelc) Database Leveld) View Level

3. Which option is NOT a data model?a) Network model b) Entity-Relationship data modelc) Object-relational modeld) Semi-Object model

4. Which statement about relational model is FALSE?

a) Collection of tablesb) Flat, “atomic” valuesc) Semi-structuredd) Can contain null values

5. If K is chosen as the principal means of identifying tuples within a relation, then K is?

a) Superkeyb) Candidate Keyc) Primary Keyd) Foreign key

6. Which language is NOT a “Pure” language?a) Relational algebrab) Tuple relational calculusc) Domain relational calculusd) SQL

7. How many basic operators in Relational Algebra?

a) 5b) 6c) 7d) 8

8. What’s the value of ? Ans:A

9. Which SQL statement does describe selecting all person whose salary is higher than $1,000 from people relation p?

a) b) c) d)

10. Which equation is NOT correct? (R(A,B,C,D) S(E,B,D) for option b)

a) b) c) d)