Find a random department and the total number of employees in the department **Table: Department Information**This table provides details about various departments in a company, including their department numbers, names, and locations.| DEPTNO | DNAME | LOC ||--------|-------------|----------|| 10 | ACCOUNTING | NEW YORK || 20 | RESEARCH | DALLAS || 30 | SALES | CHICAGO || 40 | OPERATIONS | BOSTON |- **DEPTNO**: This column represents the department number, which is a unique identifier for each department.- **DNAME**: This column lists the names of the departments.- **LOC**: This column indicates the geographical location of each department.The table showcases four departments: Accounting, Research, Sales, and Operations, located in New York, Dallas, Chicago, and Boston, respectively. **Employee Information Table**The table provides a snapshot of employee details within a company. It contains the following columns, each representing particular information about an employee:1. **EMPNO (Employee Number):** - 7839 - 75662. **ENAME (Employee Name):** - KING - JONES3. **JOB (Job Title):** - PRESIDENT - MANAGER4. **MGR (Manager Number):** - KING has no manager listed (null). - JONES reports to manager number 7839.5. **HIREDATE (Hire Date):** - KING was hired on 17-NOV-81. - JONES was hired on 02-APR-81.6. **SAL (Salary):** - KING's salary is 5000. - JONES's salary is 2975.7. **COMM (Commission):** - Both KING and JONES have no commission listed (null).8. **DEPTNO (Department Number):** - KING is in department 10. - JONES is in department 20.This table provides essential metadata for managing employee records, tracking department assignments, and understanding the organizational structure by analyzing who reports to whom.

Introduction: SQL queries are used to get data from the database, however their usefulness varies. This is because many databases have system-specific and extra proprietary additions. SQL fundamentally provides CRUD features to databases. Solution is given below :The statement including a subquery is also known as an outer query or outer select, whereas a subquery is also known as an inner query or nested query. In order to transfer the results of an inner query to the outer query, the inner query executes before its parent query. The following actions may be carried out using a subquery in a SELECT, INSERT, DELETE, or UPDATE statement: In order to compare an expression to the query's outcome. Check to see if an expression is returned by the query. Verify whether any rows are selected by the query. For example: Consider the CUSTOMERS table having the following records −a +----+----------+-----+-----------+----------+ | ID | NAME | AGE | ADDRESS | SALARY | +----+----------+-----+-----------+----------+ | 1 | Ramesh | 35 | Ahmedabad | 2000.00 | | 2 | Khilan | 25 | Delhi | 1500.00 | | 3 | kaushik | 23 | Kota | 2000.00 | | 4 | Chaitali | 25 | Mumbai | 6500.00 | | 5 | Hardik | 27 | Bhopal | 8500.00 | | 6 | Komal | 22 | MP | 4500.00 | | 7 | Muffy | 24 | Indore | 10000.00 | +----+----------+-----+-----------+----------+ Now, let us check the following subquery with a SELECT statement. SQL> SELECT * FROM CUSTOMERS WHERE ID IN (SELECT ID FROM CUSTOMERS WHERE SALARY > 4500) ;OUTPUT: This would produce the following result. +----+----------+-----+---------+----------+ | ID | NAME | AGE | ADDRESS | SALARY | +----+----------+-----+---------+----------+ | 4 | Chaitali | 25 | Mumbai | 6500.00 | | 5 | Hardik | 27 | Bhopal | 8500.00 | | 7 | Muffy | 24 | Indore | 10000.00 | +----+----------+-----+---------+----------+Explanation: According to the given data, here is using a nested query we are finding a random DEPTNO from dept random then in the main query we are selecting count of those employees who have DEPTNO equal to the randomly selected DEPTNO using count function. SQL Query: SELECT COUNT(EMPNO) AS TOTAL_EMPLOYEESFROM empWHEREemp.DEPTNO = ( SELECT DEPTNOFROM deptORDER BY RAND() LIMIT 1);

Answered: Find a random department and the total…

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Find a random department and the total number of employees in the department

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

Payback Period

Payback period analysis is a method used to determine the relative time value of a project. It measures the time that a project will take to return its initial investment. The total time taken by the project to return the initial investment made for the project is called the payback period.

Question

Find a random department and the total number of employees in the department

**Table: Department Information**

This table provides details about various departments in a company, including their department numbers, names, and locations.

| DEPTNO | DNAME | LOC |
|--------|-------------|----------|
| 10 | ACCOUNTING | NEW YORK |
| 20 | RESEARCH | DALLAS |
| 30 | SALES | CHICAGO |
| 40 | OPERATIONS | BOSTON |

- **DEPTNO**: This column represents the department number, which is a unique identifier for each department.
- **DNAME**: This column lists the names of the departments.
- **LOC**: This column indicates the geographical location of each department.

The table showcases four departments: Accounting, Research, Sales, and Operations, located in New York, Dallas, Chicago, and Boston, respectively.

**Employee Information Table**

The table provides a snapshot of employee details within a company. It contains the following columns, each representing particular information about an employee:

1. **EMPNO (Employee Number):**
- 7839
- 7566

2. **ENAME (Employee Name):**
- KING
- JONES

3. **JOB (Job Title):**
- PRESIDENT
- MANAGER

4. **MGR (Manager Number):**
- KING has no manager listed (null).
- JONES reports to manager number 7839.

5. **HIREDATE (Hire Date):**
- KING was hired on 17-NOV-81.
- JONES was hired on 02-APR-81.

6. **SAL (Salary):**
- KING's salary is 5000.
- JONES's salary is 2975.

7. **COMM (Commission):**
- Both KING and JONES have no commission listed (null).

8. **DEPTNO (Department Number):**
- KING is in department 10.
- JONES is in department 20.

This table provides essential metadata for managing employee records, tracking department assignments, and understanding the organizational structure by analyzing who reports to whom.

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