Evaluate below sql statement SELECT emp_name, department FROM employees WHERE department = 'HR' UNION SELECT contractor_name, department FROM contractors WHERE department = 'IT';Select one:a. Retrieves the names of all employees and contractors from the HR and IT departments.b. Retrieves the names of employees from the HR department and all contractors.c. Retrieves the names of employees and contractors from the HR and IT departments, excluding employees from the IT department and contractors from the HR department.d. Retrieves the names of employees from the HR department and contractors from the IT department.
Question
Evaluate below sql statement SELECT emp_name, department FROM employees WHERE department = 'HR' UNION SELECT contractor_name, department FROM contractors WHERE department = 'IT';Select one:a. Retrieves the names of all employees and contractors from the HR and IT departments.b. Retrieves the names of employees from the HR department and all contractors.c. Retrieves the names of employees and contractors from the HR and IT departments, excluding employees from the IT department and contractors from the HR department.d. Retrieves the names of employees from the HR department and contractors from the IT department.
Solution
The given SQL statement is a UNION query that combines the results of two SELECT statements. Let's break it down step by step:
- The first SELECT statement retrieves the columns "emp_name" and "department" from the "employees" table.
- The WHERE clause filters the results to only include rows where the "department" column is equal to 'HR'.
- The second SELECT statement retrieves the columns "contractor_name" and "department" from the "contractors" table.
- Again, the WHERE clause filters the results to only include rows where the "department" column is equal to 'IT'.
- The UNION operator combines the results of the two SELECT statements into a single result set.
Based on this analysis, the correct answer is: a. Retrieves the names of all employees and contractors from the HR and IT departments.
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