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Can we perform Insert, update, delete operation on view?

Yes, it is possible to perform Insert, Update, and Delete (commonly referred to as CRUD operations) on a view in SQL Server under certain conditions. However, not all views are automatically updatable. The ability to perform these operations depends on the complexity of the view definition and the underlying tables.

Here are some considerations:

  1. Simple Views: If a view is based on a single table and does not involve any complex operations like aggregations, joins, or subqueries, it is likely updatable. You can perform Insert, Update, and Delete operations on the view, and the changes will be reflected in the underlying table.
  2. Complex Views: Views that involve complex operations, such as joins, aggregations, or subqueries, may not be directly updatable. The view's definition and underlying table structure must meet specific criteria for updatable views.
  3. Updatable Views: To make a complex view updatable, you need to ensure that it meets certain conditions. These conditions include having a unique index, not including certain constructs like GROUP BY or DISTINCT, and satisfying additional restrictions specified by SQL Server.
  4. Instead of Triggers: In some cases, you can use Instead of Triggers to enable CRUD operations on a view that is not directly updatable. Instead of Triggers allow you to intercept Insert, Update, and Delete operations on a view and write custom logic to handle these operations manually.
  5. Read-only Views: Views created with certain constructs like aggregate functions (e.g., SUM, COUNT) or the TOP keyword are generally read-only. You cannot directly perform Insert, Update, or Delete operations on such views.

When working with views, it is crucial to understand their updatable nature and the limitations based on the view definition and underlying tables. You can query the "Is_Updatable" column in the "sys.views" system catalog view to check if a particular view is updatable in SQL Server.

It's important to note that even if a view is updatable, modifications made through the view may have restrictions or limitations compared to direct table access. It's recommended to review the documentation and guidelines specific to your database management system to understand the full scope and implications of performing CRUD operations on views.

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