Updating SQL Views

Create and Update a Simple View

Create a view on a single table and perform an update through the view.

Expected output: The underlying table data is updated successfully through the view.

Hint: Ensure the view includes all necessary columns and is based on one table.

Attempt to Update a Complex View

Create a view with a join and try to update it. Observe the behavior.

Expected output: An error or restriction message indicating the view is not updatable.

Hint: Most databases will not allow direct updates on such views.

Implement INSTEAD OF Trigger

Create an INSTEAD OF trigger on a complex view to enable updates.

Expected output: Updates through the view succeed by executing the trigger logic.

Hint: Write trigger logic to update the base tables correctly.

A view must be based on a single table without joins, aggregations, or set operations, and include all NOT NULL columns without defaults to be updatable.

You can use INSTEAD OF triggers to define custom update logic on complex views involving multiple tables.

Views that include joins, aggregations, or computed columns are not updatable because the database cannot unambiguously map changes back to the underlying tables.