Q. Which of the following is true ?

View solution

Q. In DML, RECONNECT command cannot be used with

View solution

Q. A hash function f defined as f (key) = key mod 13, with linear probing is used to insert keys 55, 58, 68, 91, 27, 145. What will be the location of 79 ?

View solution

Q. The User Work Area (UWA) is a set of Program variables declared in the host program to communicate the contents of individual records between

View solution

Q. Given a Relation POSITION (Posting-No, Skill), then query to retrieve all distinct pairs of posting-nos requiring skill is

View solution

Q. If a relation with a Schema R is decomposed into two relations R1 and R2 such that (R1 ∪ R2) = R1 then which one of the following is to be satisfied for a lossless joint decomposition (---> indicates functional dependency)

View solution

Q. Which level of Abstraction describes how data are stored in the data base ? 

View solution

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