Update Employee Data Through a Simple View

Update Data through a Simple Updatable View

Write a PostgreSQL query to update the salary of an employee through an updatable view.

Solution:

-- Increase the salary by 10% for the employee with ID 101 using the view.
UPDATE EmployeeView  -- Specify the updatable view based on the Employees table.
SET salary = salary * 1.10  -- Increase salary by 10%.
WHERE employee_id = 101;  -- Identify the employee.

Explanation:

• Purpose of the Query:
• The goal is to update underlying table data via a simple view that directly maps to one table.
• This demonstrates that simple views (without joins or aggregates) are inherently updatable.
• Key Components:
• UPDATE EmployeeView : Specifies the view to update.
• SET salary = salary * 1.10 : Modifies the salary column.
• WHERE employee_id = 101 : Targets a specific employee.
• Real-World Application:
• Enables application developers to expose only needed columns and allow updates without direct table access.

Notes:

• The view must be defined simply (e.g., a single table without complex expressions) to be updatable by default.

For more Practice: Solve these Related Problems:

• Write a PostgreSQL query to update the bonus amount for an employee via a simple updatable view that directly maps to the Employees table.
• Write a PostgreSQL query to update both the salary and department fields through a simple updatable view, ensuring the update affects only records with a non-null department.
• Write a PostgreSQL query to update the hire date of an employee using a simple updatable view while recalculating a derived column from the base table.
• Write a PostgreSQL query to update an employee’s performance score via a simple updatable view, where the new value is computed based on a subquery.

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