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You can add the WITH READ ONLY clause to a CREATE VIEW statement to ensure that users can only select from the view. This means the users can t modify the view and thus indirectly update, insert, or delete any rows of the underlying base tables. Otherwise, by default, Oracle allows you to update the view.
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Now the manager with the ID 122 can query the my_employees view just as he or she would a normal table, but it gives this manager information on his or her employees only. Listing 7-16 shows the output of a query on the view. Listing 7-16. Selecting Data from a View SQL> SELECT * FROM my_employees; EMPLOYEE_ID FIRST_NAME ----------- ----------133 Jason 134 Michael 135 Ki 136 Hazel 188 Kelly 189 Jennifer 190 Timothy 191 Randall 8 rows selected SQL> LAST_NAME --------Mallin Rogers Gee Philtanker Chung Dilly Gates Perkins SALARY -----3300 2900 2400 2200 3800 3600 2900 2500
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You can also specify multiple base tables or even views in the FROM clause, when creating a view. The views you create thus are called join views, and the following example shows the creation of one such view: SQL> CREATE VIEW view_1 AS SELECT ename, empno, job,dname FROM employee, dept WHERE employee.deptno IN (10, 60) AND employee.deptno = DEPT.DEPTNO; Although you use views mostly for querying purposes, under some circumstances you can also use INSERT, DELETE, and UPDATE views. For example, you can perform a DML operation on a view if it doesn t have any GROUP BY, START WITH, or CONNECT BY clauses, or any subqueries in its SELECT clause. However, since a view doesn t really exist, you ll be modifying the underlying table data, and the view will therefore be subject to the same integrity constraints as the underlying base tables. The following example shows how to insert rows into a view named sales_view, which depends on the employees table. SQL> INSERT INTO sales_view VALUES (1234, 'ALAPATI', 99); The previous statement inserts the new row into the underlying base table named employees. Updates, deletes, and inserts on a view are subject to a few restrictions. For example, when you use a CHECK constraint when creating a view, you can t insert a row or update the base table with that row, if the view can t select the row from the underlying base table. You can drop a view by simply using the DROP VIEW command, as shown here: SQL> DROP VIEW my_employees; View dropped. Instead of dropping and re-creating a view, you can also use the OR REPLACE clause to redefine a view, as shown in the following example: SQL> CREATE OR REPLACE VIEW view1 AS SELECT empno, ename,deptno FROM employee WHERE deptno=50;
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If there are other views in a database that depend on a replaced view, they ll become unusable. You can recompile an invalidated view by executing the ALTER VIEW statement. If a PL/SQL program unit such as a procedure or function depends on the view, the database may invalidate that program unit if the changes in the new view pertain to the number of view columns or the column names in the view or the data types.
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Every time you need to access a view, Oracle must execute the query that defines the view in question and get you the results. This process of populating the view is called view resolution, and it must be done afresh each time a user refers to the view. If you re dealing with views with multiple JOIN and GROUP BY clauses, this process of view resolution could take a very long time. If you need to access a view frequently, it is very inefficient to have to constantly resolve the view each time. Oracle s materialized views offer a way out of this predicament. You can think of materialized views as specialized views that have a physical representation, unlike normal views. They occupy space and need storage just like your regular tables. You can even partition materialized views and create indexes on them if necessary.
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