Oracle can you insert into a view

Ordering of new rows with respect to existing rows is not guaranteed. If a row to be inserted does not map into a specified partition or subpartition, then the database returns an error. Restriction on Target Partitions and Subpartitions This clause is not valid for object tables or object views. You can insert rows into a remote table or view only if you are using Oracle Database distributed functionality. If you omit dblink , then Oracle Database assumes that the table or view is on the local database.

Regardless of its form, it must return a collection value—that is, a value whose type is nested table or varray. This process of extracting the elements of a collection is called collection unnesting. Specify a correlation name , which is an alias for the table, view, materialized view, or subquery to be referenced elsewhere in the statement.

Specify a column of the table, view, or materialized view. If you omit one or more of the table's columns from this list, then the column value of that column for the inserted row is the column default value as specified when the table was created or last altered. For a single-table insert operation, specify a row of values to be inserted into the table or view. If you have specified a default value for the corresponding column of the table or view, then that value is inserted.

If no default value for the corresponding column has been specified, then the database inserts null. Restrictions on Inserted Values The value are subject to the following restrictions:. If you insert string literals into a RAW column, then during subsequent queries Oracle Database will perform a full table scan rather than using any index that might exist on the RAW column. The returning clause retrieves the rows affected by a DML statement.

You can specify this clause for tables and materialized views and for views with a single base table. In a multitable insert , you insert computed rows derived from the rows returned from the evaluation of a subquery into one or more tables. Table aliases are not defined by the select list of the subquery. Therefore, they are not visible in the clauses dependent on the select list. For example, this can happen when trying to refer to an object column in an expression.

To use an expression with a table alias, you must put the expression into the select list with a column alias, and then refer to the column alias in the VALUES clause or WHEN condition of the multitable insert. Newer Post Older Post Home. Subscribe to: Post Comments Atom. RSS Feed. In the next article, we will take a look at indexed views and how to work with them. I hope this article has been informative for you and I thank you for reading it.

Stay tuned for the next one…. FROM Employees ;. NULL ,. FROM Employees. Author Recent Posts. Bojan Petrovic. Oracle has some rules and restrictions that apply to updatable join views. One of them is the concept of key-preserved tables. A key-preserved table is a base table with a one-to-one row relationship with the rows in the view, via either the primary key or a unique key.