SQL views are virtual tables that enhance database management by simplifying complex queries and providing data security. They allow for data presentation without altering base tables and are useful for abstracting JOINs and aggregations. Materialized views, or indexed views in SQL Server, store query results for performance gains but require more maintenance. The text also compares SQL views with temporary tables, highlighting their storage efficiency and DML support versus full manipulation capabilities.
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SQL views are virtual tables that result from SELECT statements and provide a layer of abstraction in database management
JOINs and Aggregations
Views simplify complex queries by encapsulating JOIN and aggregation logic within the view definition
Views allow for controlled data exposure and can enforce data access restrictions
Views do not store data themselves, while tables are the fundamental storage structures in a database that support data manipulation operations
Views may impact performance, while tables can be optimized for performance through indexing
The decision to use a view or a table depends on the specific needs of the database application, balancing the benefits of abstraction and security against data manipulation and performance requirements
Materialized views, or indexed views in SQL Server, store the result set of a query physically for performance gains
Materialized views require maintenance to keep data up-to-date and consume additional storage space
Indexed views in SQL Server have a unique clustered index that enhances performance, consistency, and concurrency
Views are storage-efficient and offer limited DML support, while temporary tables provide full DML capabilities for temporary data storage
Views may introduce performance overhead, while temporary tables can be optimized for performance
Views persist beyond a single session and are accessible based on user privileges, while temporary tables are session-specific or have a global but temporary scope
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SQL View Definition
A virtual table resulting from a SELECT statement or combination thereof.
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SQL View Data Presentation
Allows data presentation in specific format without altering base tables.
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SQL View Performance Impact
Can improve readability but may affect performance; not all data manipulations supported.
