Lec-112: View in Database | Oracle, SQL Server Views | Types of Views
Gate Smashers・2 minutes read
Views in databases are virtual tables created from stored queries, allowing for data access restriction and simplifying complex queries. Understanding views in databases is crucial for interviews and practical application in database management.
Insights
- Views in databases are virtual tables created from stored queries, offering a simplified way to access and manipulate data without taking up physical space like regular tables.
- Materialized views, a type of view, serve as snapshots of data, aiding in advanced data processing tasks such as data warehousing and data mining, showcasing the versatility and utility of database views beyond basic querying functions.
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Recent questions
What are database views?
Virtual tables created from stored queries.
How do views benefit database management?
Simplify complex queries and enhance data security.
What is the difference between materialized views and regular views?
Materialized views store data snapshots, while regular views display live data.
How do views contribute to data access restriction?
By presenting different data perspectives based on user roles.
Why are views essential for database interviews?
Understanding SQL basics and data management principles.
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Summary
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Importance of Views in Database Management
- Views in databases are crucial for placement interviews and understanding SQL basics, including DDL, DML, and DCL commands.
- A view in a database is a virtual table created from a stored query, not occupying physical space like a regular table.
- Views can be read-only or updatable, with changes in the base table reflecting in the view and vice versa.
- Materialized views are snapshots of data, useful in advanced data processing like data warehousing or data mining.
- Views allow for data access restriction, making complex queries simpler, and providing data independence.
- Creating views helps present different data perspectives to various users based on their roles and privileges.
- Views are essential for security, simplifying complex queries, and presenting data in different ways to different users.
- Understanding views in databases is crucial for interviews and practical application in database management.
