**Understanding Relations in Databases**Here is a table representing a relation named R:``` A B C0 1 23 4 56 7 8```Based on this table, let's identify the following:1. **The attributes of R**: - The attributes of the relation R are A, B, and C, which correspond to the columns in the table.2. **The schema of R**: - The schema of R describes the structure of the relation, including its attributes. Hence, the schema of R is R(A, B, C).3. **The tuples of R**: - The tuples are the rows in the table. The tuples of R are (0, 1, 2), (3, 4, 5), and (6, 7, 8).4. **The components of the tuples for each attribute of R**: - For attribute A: 0, 3, 6. - For attribute B: 1, 4, 7. - For attribute C: 2, 5, 8.**Question:**Which of the following is NOT a true statement about relation R?- **A.** The schema of R is R(A, B, C).- **B.** (0, 3, 6) is a tuple of R.- **C.** 4 is the value of the B-component of one of the tuples of R.- **D.** (3, 4, 5) is a tuple of R.**Analysis:**- Statement A is correct, as the schema of R is indeed R(A, B, C).- Statement B is incorrect. (0, 3, 6) is not a tuple of R; it seems to be the values from the first component of different tuples.- Statement C is correct, as 4 is the value of the B-component of the second tuple (3, 4, 5).- Statement D is correct, as (3, 4, 5) is indeed a tuple of R.

The question is asking which of the given statements is NOT true about relation R.

Here is a table representing a relation named K ABC 012 345 678 Identify: 1. The attributes of R. 2. The schema of R. 3. The tuples of R. 4. The components of the tuples for each attribute of R. Which of the following is NOT a true statement about relation O A. The schema of R is R(A,B,C). OB. (0,3,6) is a tuple of R. 3 C.4 is the value of the B-component of one of the tuples of E O.(3,4,5) is a tuple of R.

Here is a table representing a relation named K ABC 012 345 678 Identify: 1. The attributes of R. 2. The schema of R. 3. The tuples of R. 4. The components of the tuples for each attribute of R. Which of the following is NOT a true statement about relation O A. The schema of R is R(A,B,C). OB. (0,3,6) is a tuple of R. 3 C.4 is the value of the B-component of one of the tuples of E O.(3,4,5) is a tuple of R.

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

See similar textbooks

Similar questions

23 of 40 Let R(A, B, C, D, E, F) be a relation with FD's: {D → CE, C → BDE, E → AD, AF → E, B → DF}. Which of the following statements is correct? Select one: O Ris in BCNF but not in 3NF. O Ris in 3NF but not in BCNF. O Ris not in 3NF and not in BCNF. O R is in 3NF and in BCNF.
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).
List all nontrivial functional dependencies satisfied by the relation of Figure7.18.
What is the highest normal form for the following relation and its functional dependencies? Assume it is in INF. A(x, w. z) • X- w 1NF BCNF 2NF 3NF cannot be determined
Lab 3: Normalization Assignment: Problem #11 from Chapter #6. (Be sure to note that this is PROBLEM and not REVIEW QUESTION). Normalize a set of data to 1st, 2nd and 3rd normal form by creating relational schemas, dependency diagrams and an Entity Relationship Diagram (crow’s foot notation). For this lab, complete problem #11 in Chapter 6. Be sure to complete each letter (a thru c) for the problem. The ERD for letter cmust be completed with the use of Microsoft Visio. Remember to include headers on all documents you submit to include a brief descriptive title, your name and a date. Question 11: Given the sample records in the CHARTER table shown in Table P6.11, do the following: Write the relational schema and draw the dependency diagram for the table structure. Make sure that you label all dependencies. CHAR_PAX indicates the number of passengers carried. The CHAR_MILES entry is based on round-trip miles, including pickup points. (Hint: Look at the data values to determine the…
ER model relationships are represented using a.) relationship keys b.) primary keys c.) crows foot symbols d.) main keys What do the cardinalities in an ER model show, (please select all that apply)? a.) only a one to one relationship. b.) the minimum number of entities that can be involved in a relationship. c.) only a many to many relationship.
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
COM. Q. CUSTOMER (CID, NAME, STREET, CITY, STATE, AGE) SALE (PID, CID, DATE, COST) PART (PID, PNAME, COLOR) The meaning of these relations is straightforward; for example, SALE has one tuple for every part sold to a customer. Primary key attributes are underlined. For instance, PID and CID together form the primary key of relation SALE. SALE.PID is a foreign key that refers to PART.PID, while SALE.CID is a foreign key that refers to CUSTOMER.CID. Write SQL statements for the following retrieval and update operations. Retrieve the names of all the customers from the city of "Trenton' who bought a part at a cost less than $50. No duplicates should appear in the answer. Retrieve the names of red parts bought by a customer who is younger than 40 and from a customer who is older than 40. Delete all parts that are never bought by a customer from "Trenton" (this is a data change statement). Retrieve the names of the customers who never bought a green part. Retrieve the names of the…
What is the connection between the primary key of a relation and the functional relationships that exist between all of its attributes?
Attributes from the identifying entity set's main key may be added to a weak entity set to make it strong. Please describe the overlap that will develop as a result of our choice.
Select all binary relation properties that apply to the following relation: Equal magnitude: |x| = lyl O antisymmetric O reflexive O symmetric O transitive
Consider the relations Courses1, Courses2, _Enrollment and Students. Courses1 Location cid ename Al Calculus LI A2 Algebra L2 A5 English L3 Student(sid, sname, age, level) Courses2 cid A5 BI B2 name English History b) Courses 1-Courses2 L3 L4 Computing L5 c) Courses Courses2 Classroom d) Courses1 Enrollment (1) Give the results of the following relational algebra expressions: a) Teid ( name='History' OR 'Computing (Courses2)) e) Enrollment / Teid (Courses1) Enrollment cid Al A5 sid 101 102 103 102 102 B1 Al A2 (2) Write the following query in Relational Algebra. a) Find the sids of students who have enrolled in _course Calculus. b) Find the names of students who have enrolled in course Calculus. _c) Find the names of students who have enrolled at least one course. d) Find the names of students who have enrolled in _Calculus or Algebra. e) Find the sids of students who have enrolled in all courses (both Courses1 and Courses2).