Oracle updating through a view Cybercam sarah terry
There are also certain other constructs that make a view nonupdatable.
To be more specific, a view is not updatable if it contains any of the following: .
CREATE VIEW sup_orders AS SELECT suppliers.supplier_id, orders.quantity, orders.price FROM suppliers INNER JOIN orders ON suppliers.supplier_id = orders.supplier_id WHERE suppliers.supplier_name = 'Microsoft'; CREATE or REPLACE VIEW sup_orders AS SELECT suppliers.supplier_id, orders.quantity, orders.price FROM suppliers INNER JOIN orders ON suppliers.supplier_id = orders.supplier_id WHERE suppliers.supplier_name = 'Apple'; A VIEW in Oracle is created by joining one or more tables.
When you update record(s) in a VIEW, it updates the records in the underlying tables that make up the View.
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It's great to get the extra features, but it makes it harder to nail down exactly what you can and cannot do with views.Since you can't list more than one table in the Oracle UPDATE statement, you can use the Oracle EXISTS clause.Views are saved SELECT statements that allow you to operate on the results that are returned from them.For information about generated columns, see Section 126.96.36.199, “CREATE TABLE and Generated Columns”.It is sometimes possible for a multiple-table view to be updatable, assuming that it can be processed with the are illegal and are rejected.
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The SQL-92 standard also mandates that views cannot be sorted with an values with a view; to support that, it also supports sorting.