Practical Guide to Updating Views in PostgreSQL

This resource offers a total of 50 PostgreSQL Updating views problems for practice. It includes 10 main exercises, each accompanied by solutions, detailed explanations, and four related problems.

Following exercises cover various scenarios of updating views and demonstrate techniques—such as using INSTEAD OF triggers, rules, and WITH CHECK OPTION—to manage data modifications through views in PostgreSQL.

1. Update Data through a Simple Updatable View

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

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2. Update Data through a View with WITH CHECK OPTION

Write a PostgreSQL query to update an employee's department via a view that enforces a condition using WITH CHECK OPTION.

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3. Update Data through a View Using an INSTEAD OF Trigger

Write a PostgreSQL query to update a view that joins two tables. (Assume an INSTEAD OF trigger is defined to handle the update.)

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4. Refresh a Materialized View after Underlying Updates

Write a PostgreSQL query to refresh a materialized view so that it reflects the most recent data changes.

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5. Update Data through a View with Column Aliases

Write a PostgreSQL query to update a record via a view that uses column aliases for clarity.

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6. Update a View with Computed Columns by Modifying Base Data

Write a PostgreSQL query to update underlying data through a view that includes computed columns.

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7. Update Data through a Partitioned View

Write a PostgreSQL query to update salaries for employees in a specific region via a partitioned view.

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8. Attempt to Update a Non-Updatable Aggregated View

Write a PostgreSQL query to update an aggregated view and note the expected error.

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9. Update Data Through a View Using a Rule

Write a PostgreSQL query to update a customer’s email via a view that uses a rule for update redirection.

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10. Update Data Through a View with a Subquery Condition

Write a PostgreSQL query to update the salary for senior employees via a view that selects employees based on a subquery.

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More to Come !

Do not submit any solution of the above exercises at here, if you want to contribute go to the appropriate exercise page.