Q. Third normal form is based on the concept of ______.

View solution

Q. The student. marks should not be greater than 100. This  is

View solution

Q. GO BOTTOM and SKIP-3 commands are given one after another in a database file of 30 records. It shifts the control to

View solution

Q. An ER Model includes
1. An ER diagram portraying entity types.
II. Attributes for each entity type
III. Relationships among . entity types.
IV. Semantic integrity constraints that reflects the business rules about data not captured in the ERdiagram.

View solution

Q. Based on the cardinality ratio and participation______________associated with a relationship type, choose either the Foreign Key Design, the Cross Referencing Design or Mutual Referencing Design.

View solution

Q. Data Integrity control uses _______________

View solution

Q. Consider the following schemas
Branch = (Branch-name, Assets, Branch-city)
Customer = (Customer-name, Bank name, Customer-city)
Borrow = (Branch~name, loannumber, customer account-number)
Deposit = (Branch-name, Accountnumber,
Customer-name, Balance)
Using relational Algebra, the Query that finds customers who have balance more than 10,000 is_______

View solution

Q. Find the false statement :

View solution

Q. Consider the table:

Student (stuid, name, course, marks)
Which one of the following two queries is correct to find the highest marks student in course 5 ?

Q.1. Select S.stuid From student S Where not exists  (select * from student e where e.course = '5' and e.marks ≥s.marks)

Q.2. Select s.stuid From student S Where s.marks >any (select distinct marks from student S where s.course =5)

View solution

Q. Armstrong (1974) proposed systematic approach to derive functional dependencies. Match the following w.r.t. functional dependencies:

a.Decomposition Rule (i)   If X →Y and Z →W then {X, Z} → {Y, W}

b. Union Rule (ii)  If X →Y an  {Y,W} → Z then {X, W} → Z

c. Composition Rule (iii) If X →Y and X →Z then X → {Y, Z}
 
d. Pseudo transitivity Rule (iv) If X →{Y,Z} and  {Y,W} → Z then X → Y and  X →Z

View solution

Q. Match the following:
List - I                                         List - II

a. Secondary                          i.    Functional Dependency
Index

b. Nonprocedural                  ii.  B-Tree
Query
Language

c. Closure of                           iii. Relational Algebraic
set of                                                Operation
Attributes

d.  Natural                              iv. Domain Calculus
JOIN

View solution

Q. The best normal form of relation scheme R(A. B, C, D) along with the set of functional dependencies F = {AB → C, AB → D, C → A, D → B} is

View solution

Q. Identify the minimal key for relational scheme R(A, B, C, D, E) with functional dependencies F = {A → B, B → C, AC → D}

View solution

Q. Division operation is ideally suited to handle queries of the type :

View solution

Q. What kind of mechanism is to be taken into account for converting a weak entity set into strong entity set in entity-relationship diagram?

View solution

Q. Which of the following is true?

I.  Implementation of self-join is possible in SQL with table alias.

II. Outer-join operation is basic operation in relational algebra.

III. Natural join and outer join operations are equivalent.

View solution

Q. Which of the following is correct?

I. Two phase locking is an optimistic protocol.
II. Two phase locking is pessimistic protocol
III. Time stamping is an optimistic protocol.
IV. Time stamping is pessimistic protocol.

View solution

Q. ________________rules used to limit the volume of log information that has to be handled and processed in the event of system failure involving the loss of volatile information.

View solution

Q. Let R = ABCDE is a relational scheme with functional dependency set F = {A -> B, B ->C,AC -> D}. The attribute closures of A and E are

View solution

Q. Consider the following statements:

I. Re-construction operation used in mixed fragmentation satisfies commutative rule.
II. Re-construction operation used in vertical fragmentation satisfies commutative rule
Which of the following is correct?

View solution