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Given the relations employee (name, salary, dept-no), and department (dept-no, dept-name,address) Which of the following queries cannot be expressed using the basic relational algebra operations (σ, π, x, -, ∪, p)
  • a)
    Department address of every employee
  • b)
    Employees whose name is the same as their department name
  • c)
    The sum of all employees' salaries
  • d)
    All employees of a given department
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Given the relations employee (name, salary, dept-no), and department (...
The sum of all employees' salaries can not be found using these above operations as to calculate sum we need aggregate functions and operators. So, option (C) is correct.
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Most Upvoted Answer
Given the relations employee (name, salary, dept-no), and department (...
Projection, selection, union, intersection, difference, cartesian product, and renaming)?

A. Find the names of all employees who work in the "Sales" department.
B. Find the average salary of all employees.
C. Find the names of all employees who have a salary greater than $50,000.
D. Find the department names and addresses for all departments.
E. Find the names of all employees who work in the "Sales" department and have a salary greater than $50,000.

The query that cannot be expressed using the basic relational algebra operations is E. Find the names of all employees who work in the "Sales" department and have a salary greater than $50,000. This query requires both a selection operation (to filter employees in the "Sales" department) and another selection operation (to filter employees with a salary greater than $50,000), which cannot be expressed using basic relational algebra operations alone.
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Given the relations employee (name, salary, dept-no), and department (dept-no, dept-name,address) Which of the following queries cannot be expressed using the basic relational algebra operations (σ, π, x, -, ∪, p)a)Department address of every employeeb)Employees whose name is the same as their department namec)The sum of all employees salariesd)All employees of a given departmentCorrect answer is option 'C'. Can you explain this answer?
Question Description
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