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To refer to the remote database in a subquery, append the database link name to the table names in the FROM clause of the subquery.
An example of this is shown in the following listing: NOTE If you do not append the database link name to the table names in the FROM clause of UPDATE subqueries, tables in the local database will be used.
A view can contain all rows of a table or select rows from a table.
A view can be created from one or many tables which depends on the written SQL query to create a view.
If they do not satisfy the condition(s), the UPDATE or INSERT returns an error.You can use subqueries in the SET portion of the UPDATE command.The FROM clause of such subqueries can reference either the local database or a remote database.A view is nothing more than a SQL statement that is stored in the database with an associated name.A view is actually a composition of a table in the form of a predefined SQL query.