If v is a scalar and R is a relation, whichstatement holds?Select one:a. All of the above are trueO b. v < ALL R means V is the minimumvalue in RС.v != ALL R means V not in RO d.V = ALL R means V in RStudentsRosternamelastnameageIDIDmajor absencerimismail19123123 EE4.sarakamel18134134 EE7miladghantous2113451345 CCE2tarekdib18 1234512345 ME4Complete the query that finds all studentnames and last names for those who are 18years old and they're registered in EE major.Select one:SELECT name,lastname FROM studentsWHERE age=18 AND ID IN (SELECT IDFROM roster WHERE major='EE')SELECT ID FROM students WHERE ID IN(SELECT ID FROM roster WHERE major='EE')SELECT name, lastname FROM studentsWHERE age=D18 and ID= SELECT ID fromroster WHERE major='EE') What is the output of the following query?SELECT Eid FROM Employee WHERE EidNOT EXIST (SELECT Eid FROM EmployeeWHERE Did = 15);%3DEmployeeSalarycodeEnameDidEidEphoneSamer1523234570092485Sarah1312508871092246Ahmad426771203099348Jalal1522966476093148Elie823305470092729Fadi24297603091945Layal21449071099380Select one:a. (5088, 7712, 3054, 2976, 4490)O b. Empty TableO c. (2345,9664)O d. Wrong SQL SyntaxWrite a corresponding query to increase theprices of Coke Zero to 1250 at SpinneysSupermarketDrinkPriceSpinneysCoke Zero750TSCCoke Zero1000SpinneysPepsi Max750TSCMr. Juicy500FahdCoke Zero1000SpinneysMr. Juicy750Select one:O a. Insert into supermarket (Supermarket,Drink, Price) values (Spinneys, Coke Zero,1250)O b. Insert into supermarket values(Spinneys, Coke Zero, 1250)O c. Update supermarket (Supermarket,Drink, Price) set Price=1250 whereSupermarket="Spinneys"O d. Update supermarket set Price=1250where Supermarket="Spinneys"

Answered: If v is a scalar and R is a relation,…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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4. Write the relation matrix for the relation R on the set (a,b.c.d.e.f) which is defined as follows: R={a,a), (a,b), (a,c), (b,a). (b,c). (c,a), (c,b), (d,d), (f.f).
let R be a relation defined on the set z by aRb if a < b. What property/properties are violated? A. Symmetric & transitive B. Reflexive & Symmetric C. Reflexive & Transitive D. All three properties
For each of the following pairs of expressions, give instances of relations thatshow the expressions are not equivalent. ΠA(r − s) and ΠA(r) − ΠA(s).
B. Draw the digraph of the relation on {a, b, c, d} 1. {(a, b), (b, b), (b, c), (c, d), (d, a)} 2. {(a, b), (b, c), (c, d), (c, a), (d, a), (d, b)}
Consider the relation instance and functional dependencies below. Which of these FDs hold on the instance and which do not? A BC 2 4 АВ — С A → B A → C В > с АС — В ВС — А 3 4 В > А C → A C → B 1 3 5 2 4
An instance of a relation A. is serializable B. is dynamic C. is static D. is never empty
Exercise 4: R1 = {(a, b) E R² | a > b}, the “greater than" relation, R2 = {(a, b) E R² | a > b}, the “greater than or equal to" relation, R3 = {(a, b) E R² | a < b}, the "less than" relation, R4 = {(a, b) E R² | a
1. Consider the relation R on the set (a,b.c,d,e,f] which is defined as follows: R-{(a,a), (a,b). (a.c). (b.a). (b.c), (c,a). (c,b). (d.d), (f.f)}. Is R reflexive? Is R symmetric? Is R anti-symmetric? Is R transitive? Give reasons!
TRUE OR FALSE In the Relational Data Model, Referential Integrity Constraint is a special kind/case of Foreign Key Constraint. Multiple Inheritance happens when a class has more than one sub-class. This problem can be observed in Programming Languages as well. Given two relations named A and B, if we q-JOIN A and B, the maximum number of attributes in the result relation could be (the number of attributes of A) times(*) the number of attributes of B). * in an SQL SELECT statement means “all the tuples”. In relational algebra, Cartesian Product (X) can be implemented using the q-JOIN operator. Cartesian Product ISA q-JOIN where q-condition always evaluates to true. SQL is based on Predicate Calculus. A query in SQL always specifies what should be included in the query result.
8 of 40 Let R(A, B, C, D, E, F) be a relation with FD's: {D → C, C → D, D – E, C → E, E → AD, AF → E, D → B}. Which of the following statements is correct? Select one: O R is not in 3NF but in BCNF. Ris not in 3NF and not in BCNF. O Ris in 3NF but not in BCNF. O R is in 3NF and in BCNF.
36. In a relation a. Ordering of rows is immaterial b. No two rows are identical c. a and b both are true d. None of these
What does the Weak Entity set entail?

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If v is a scalar and R is a relation, which statement holds? Select one: