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Solved Examples

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Consider the attributes ABCDEFG which have the following functional dependencies: AD→F, AE→G. DF→BC, E→C, G→E
- Techtud Admin
- 6 months 3 days ago
- Normalization

- 0
- Views
- 172
- Likes

Which of the following queries will produce a different result set?
- Techtud Admin
- 6 months 3 days ago
- SQL

- 0
- Views
- 91
- Likes

Given the following Relational Calculus statement: {B l ∃ B ∈ Books (∃ A1 ∈ Authors ((AI birth tear > 1920) (∃A2 ∈ Authons (A2. birth Year > 1920 ∧ A2. binth. Yeaor > Albirth Year ∧ B. author = A2. name))) Choose the relational Algebra expressions
- Techtud Admin
- 6 months 3 days ago
- Relation Algebra

- 0
- Views
- 87
- Likes

For the following schema: Athletes (name, country, sports, age, height, weigh)
- Techtud Admin
- 6 months 3 days ago
- Database Management System

- 0
- Views
- 244
- Likes

Which of the following queries returns the department numbers of those departments for which there is no courses being offered?
- Techtud Admin
- 6 months 3 days ago
- Computer Science and Information Technology

- 0
- Views
- 74
- Likes

Which of the following SQL queries find the accident with the smallest cost and return the corresponding owner of the car, his/ her address and the amount of damage.
- Techtud Admin
- 6 months 3 days ago
- SQL

- 0
- Views
- 81
- Likes

What is the maximum number of entities (A, B, C) that could be in the ternary relationship set R
- Techtud Admin
- 6 months 3 days ago
- ER Model

- 0
- Views
- 81
- Likes

Identify the correctness of the following two statements
- Techtud Admin
- 6 months 3 days ago
- Normalization

- 0
- Views
- 97
- Likes

What is the maximum number of tupIes possible in the natural join R JOIN S?
- Techtud Admin
- 6 months 3 days ago
- JOIN

- 0
- Views
- 77
- Likes

Identify the highest normal form of this relation
- Techtud Admin
- 6 months 3 days ago
- Normalization

- 0
- Views
- 92
- Likes

Consider the schedule as given below: S: W3(Y); R1(Y); R3(X); W1(Y); R2(Z); R1(X); W3(Z); W1(X); W2(Y)
- Techtud Admin
- 6 months 3 days ago
- Computer Science and Information Technology

- 0
- Views
- 92
- Likes

Consider the relation neation S ((A, B, C, D) with functional dependencies B - C and D A. Consider dependencies the decomposition of s into SI (A, B, C) and 52 (A, D). This s decomposition decomposition is (A) not dependency - preserving, not IosIess (B)
- Techtud Admin
- 6 months 3 days ago
- Computer Science and Information Technology

- 0
- Views
- 72
- Likes

In the timestamp Ordering Protocol, R - timestamp (Q) and w - time stamp (Q) are defined by the largest timestamp among the transactions with which have respectively read and written the data item Q. Consider a variant of the protocol where R - timestamp
- Techtud Admin
- 6 months 3 days ago
- Computer Science and Information Technology

- 0
- Views
- 80
- Likes

Which of the following statements are true? i) If (A→BC, C→D), then A→D ii) If(A→B,AB→C), then A→C ii) If (A→BC, CD→E), then A→E (A) (i) only (B) (i) and (ii) only (C)(ii) and (iii) only (D)(iii) and (i) only
- Techtud Admin
- 6 months 3 days ago
- Database Management System

- 0
- Views
- 88
- Likes

Consider the following definition of a table in SQL: Create table abc ( x integer, y integer, primary key (x), foreign key (y) references abe on delete cascade
- Techtud Admin
- 6 months 3 days ago
- Computer Science and Information Technology

- 0
- Views
- 67
- Likes

Indicate the correctness of the following two equalities
- Techtud Admin
- 6 months 3 days ago
- Computer Science and Information Technology

- 0
- Views
- 81
- Likes

Recall that a predicate logic statement is contingent if its truth value depends on the choice of the universe and on the interpretations of the predicate symbol S and the constant symbol b involved. Consider the following predicate logic statements in wh
- Techtud Admin
- 7 months 5 days ago
- Computer Science and Information Technology

- 0
- Views
- 111
- Likes

In a 2 level control unit design there exists 1 K word micro control memory and a 32 word nano control memory. If it is desired to provide 24 control signals, what is the % of reduction in control memory if we design control memory using nanoprogramming w
- Techtud Admin
- 7 months 5 days ago
- Computer Science and Information Technology

- 1
- Views
- 114
- Likes

int a(char *p) { if(*p != '\0') { printf("%c", *p); b(p+1); b(p+1); } return 0; } int b(char *p){ if(*p != '\0') { a(p+1); printf("%c", *p); a(p+1); } return 0; } int main() { a(
- Techtud Admin
- 7 months 5 days ago
- Computer Science and Information Technology

- 0
- Views
- 119
- Likes

Given a set A ⊆ {0, 1}*, let A' = {xy | x1y ∈ A}. That is , A' consists of all strings obtained from a string in A by deleting exactly one 1. If A is regular, then A' is (A) Regular (B) Context free but not regular (C) Recursive but not context free (D)
- Techtud Admin
- 7 months 6 days ago
- Computer Science and Information Technology

- 0
- Views
- 100
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