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SQL Tutorial - 49: Views in SQL (Part-2) Video Lecture | Microsoft SQL for Beginners - Database Management

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FAQs on SQL Tutorial - 49: Views in SQL (Part-2) Video Lecture - Microsoft SQL for Beginners - Database Management

1. What is a view in SQL?
Ans. A view in SQL is a virtual table that is based on the result of a SQL query. It is created by selecting columns from one or more tables and can be used like a regular table in SQL operations.
2. How can views be beneficial in database management?
Ans. Views in database management provide several benefits, such as simplifying complex queries by encapsulating them into a single view. They also enhance security by allowing users to access only specific columns of a table through views, instead of granting direct access to the underlying table.
3. Can views be updated in SQL?
Ans. Yes, views can be updated in SQL, but there are certain conditions that need to be met. The view must be based on a single table, and the columns being updated should not participate in any aggregate functions or calculations. Additionally, the view must have a unique key defined to ensure that the updates are applied correctly.
4. How can views improve performance in SQL?
Ans. Views can improve performance in SQL by pre-computing complex queries and storing the results. This reduces the need for executing the same complex query multiple times, as the view can be used instead. Additionally, views can be indexed, which further enhances query performance.
5. Are views stored physically in the database?
Ans. No, views are not stored physically in the database. They are virtual tables that are dynamically generated based on the underlying query. The view definition is stored in the database, but the actual data is not duplicated or stored separately. The data is fetched from the underlying tables when the view is queried.

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