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
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**Understanding Relations in Databases**

Here is a table representing a relation named R:

```
   A B C
0 1 2
3 4 5
6 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.
Transcribed Image Text:**Understanding Relations in Databases** Here is a table representing a relation named R: ``` A B C 0 1 2 3 4 5 6 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.
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