You can use a view in most places where a table can be used.
Changes applied to the data in a relevant underlying table are reflected in the data shown in subsequent invocations of the view.
In some No SQL databases, views are the only way to query data.
An updatable view is one which allows performing a UPDATE command on itself without affecting any other table. The view is defined based on one and only one table. The view must include the PRIMARY KEY of the table based upon which the view has been created. The view should not have any field made out of aggregate functions. The view must not have any DISTINCT clause in its definition. The view must not have any GROUP BY or HAVING clause in its definition. The view must not have any SUBQUERIES in its definitions. If the view you want to update is based upon another view, the later should be updatable. Any of the selected output fields (of the view) must not use constants, strings or value expressions.
A view takes the output of a query and makes it appear like a virtual table.
Views can provide advantages over tables: Just as a function (in programming) can provide abstraction, so can a database view.
In another parallel with functions, database users can manipulate nested views, thus one view can aggregate data from other views.
JRockit was made free and publicly available in May 2011.
Many JRE class files distributed with JRockit exactly replicate those distributed with Hot Spot.
Because of this, they tend to leave out is a table, so it is named just like any other table.