Merge Employee and Department Data in a Single View

Create a View with a Join

Write a PostgreSQL query to create a view that joins the Employees and Departments tables.

Solution:

-- Create a view to display employee names along with their department names.
CREATE VIEW EmployeeDepartment AS
SELECT e.employee_id, e.name, d.department_name
FROM Employees e
JOIN Departments d ON e.department_id = d.department_id;

Explanation:

• Purpose of the Query:
• The goal is to combine data from two related tables into one view for easier querying.
• This demonstrates the use of JOINs within a view.
• Key Components:
• JOIN Departments d ON e.department_id = d.department_id : Specifies the join condition.
• Aliases (e and d) improve readability and manageability.
• Real-World Application:
• Simplifies reporting by providing a single source for employee and department information.

Notes:

• Ensure that the join condition correctly relates the tables to avoid mismatched data.

For more Practice: Solve these Related Problems:

• Write a PostgreSQL query to create a view that joins Employees, Departments, and Projects tables, including only employees assigned to a project.
• Write a PostgreSQL query to create a view that performs a self-join on the Employees table to display each employee alongside their manager’s name.
• Write a PostgreSQL query to create a view that joins Employees and Salaries tables, filtering to show records where the salary exceeds the department average.
• Write a PostgreSQL query to create a view that left joins Orders and Customers, ensuring orders with no matching customer are still included.

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Previous PostgreSQL Exercise: Create a Simple View.
Next PostgreSQL Exercise: Create a Filtered View.