5 A 1 R 4 6 B 2 6 8 B 4 9 7 с 5 The full outer join has 3 NULLS. he left outer join has 4 NULLS. S a. The right outer join has 2 rows. The right outer join has no NULLs. 2 ally, find the correct statement in the list below. D 1 2 3 4 Compute the full outer join on B, the left outer join on B, and the right outer join on B. In each case, R is the left operand and S is the right operand. Then, answer the following questions for each of the three r How many rows are there in the result? How many NULL's appear in the result?

5 A 1 R 4 6 B 2 6 8 B 4 9 7 с 5 The full outer join has 3 NULLS. he left outer join has 4 NULLS. S a. The right outer join has 2 rows. The right outer join has no NULLs. 2 ally, find the correct statement in the list below. D 1 2 3 4 Compute the full outer join on B, the left outer join on B, and the right outer join on B. In each case, R is the left operand and S is the right operand. Then, answer the following questions for each of the three r How many rows are there in the result? How many NULL's appear in the result?

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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Concept explainers

Intermediate SQL Concepts

A query is a request for data or information from one or more database tables. This information could be presented in the form of pictorials, graphs, or complicated findings which helps in easy interpretation. Structured Query Language (SQL) is the most widely used programming language for retrieving and organizing data from relational databases. Collection of tables with rows and columns is referred to as a database. SQL is the language of databases. It makes it easier to extract specific data from databases, which can then be used for analysis.

Question

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### Database Joins: Full, Left, and Right Outer Joins

Suppose relations \( R(A, B) \) and \( S(B, C, D) \) are as follows:

#### Relation \( R \):
| **A** | **B** |
|------|------|
| 1 | 2 |
| 3 | 4 |
| 5 | 6 |

#### Relation \( S \):
| **B** | **C** | **D** |
|------|------|------|
| 4 | 5 | 1 |
| 5 | 2 | 4 |
| 6 | 7 | 2 |
| 8 | 9 | 3 |

Compute the full outer join on B, the left outer join on B, and the right outer join on B. In each case, \( R \) is the left operand and \( S \) is the right operand. Then, answer the following questions for each of the three results:

1. How many rows are there in the result?
2. How many NULLs appear in the result?

Finally, find the correct statement in the list below:

1. a. The right outer join has 2 rows.
2. b. The right outer join has no NULLs.
3. c. The full outer join has 3 NULLs.
4. d. The left outer join has 4 NULLs.

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