This technique allows the definition of other logic for execution in place of an insert, update, or delete operation on the views.
Thus database systems can implement data modifications based on read-only views.
Microsoft SQL Server introduced in its 2000 version indexed views which only store a separate index from the table, but not the entire data.
Postgre SQL implemented materialized views in its 9.3 release. When queries are run against views, the query is modified.
Since sets are not ordered — by definition — neither are the rows of a view.
Therefore, an ORDER BY clause in the view definition is meaningless; the SQL standard (SQL:2003) does not allow an ORDER BY clause in the subquery of a CREATE VIEW command, just as it is refused in a CREATE TABLE statement.
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In another parallel with functions, database users can manipulate nested views, thus one view can aggregate data from other views.
Then another point that also poses a problem, Moving an item to a different date / time, create an error?
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In database theory, a view is the result set of a stored query on the data, which the database users can query just as they would in a persistent database collection object.
Oracle Database introduced the concept of materialized views: pre-executed, non-virtual views commonly used in data warehousing.