How do I delete a view in Oracle?

To remove a view from the database, you use the following DROP VIEW statement:

1. DROP VIEW schema_name.view_name [CASCADE CONSTRAINT];
2. CREATE VIEW salesman AS SELECT * FROM employees WHERE job_title = ‘Sales Representative’;
3. SELECT * FROM salesman;

How do I modify a view in Oracle?

The only options for altering a view are to add/drop/modify constraints or to RECOMPILE the view. If you want to add columns then just run the CREATE OR REPLACE VIEW statement again with a different select.

What can be altered about a view?

If you remember the CREATE VIEW SQL syntax, a view can be modified by simply using the ALTER VIEW keyword instead, and then changing the structure of the SELECT statement. Therefore, let’s change the previously created view with the CREATE VIEW SQL statement by using the ALTER VIEW statement.

Which command helps in redefining the view definition without dropping the existing view?

You can also use ALTER VIEW to define, modify, or drop view constraints. This statement does not change the definition of an existing view. To redefine a view, you must use CREATE VIEW with the OR REPLACE keywords.

How do I delete a schema view?

Use the DROP VIEW statement to remove a view or an object view from the database. You can change the definition of a view by dropping and re-creating it. The view must be in your own schema or you must have the DROP ANY VIEW system privilege. Specify the schema containing the view.

How do you remove a view?

To delete a view from a database

1. In Object Explorer, expand the database that contains the view you want to delete, and then expand the Views folder.
2. Right-click the view you want to delete and click Delete.
3. In the Delete Object dialog box, click OK.

Can we alter view in SQL?

The ALTER VIEW command allows you to modify a view. A view is based on the result set from a query consisting of a SELECT statement or a UNION of two or more SELECT statements. To determine if a specified view exists in the current namespace, use the $SYSTEM. SQL.

Where are Oracle views stored?

In Oracle, view is a virtual table that does not physically exist. It is stored in Oracle data dictionary and do not store any data. It can be executed when called. A view is created by a query joining one or more tables.

How do I alter a view?

The ALTER VIEW command allows you to modify a view. A view is based on the result set from a query consisting of a SELECT statement or a UNION of two or more SELECT statements. See CREATE VIEW for further information on using a UNION. To determine if a specified view exists in the current namespace, use the $SYSTEM.

Can we ALTER VIEW in Snowflake?

Modifies the properties for an existing view. Currently the only supported operations are: Adding, overwriting, removing a comment for a view. …

When to use alter view in Oracle Database?

You can also use ALTER VIEW to define, modify, or drop view constraints. This statement does not change the definition of an existing view. To redefine a view, you must use CREATE VIEW with the OR REPLACE keywords. When you issue an ALTER VIEW statement, Oracle Database recompiles the view regardless of whether it is valid or invalid.

How to drop a view in Oracle Database?

Introduction to Oracle DROP VIEW statement To remove a view from the database, you use the following DROP VIEW statement: DROP VIEW schema_name.view_name [ CASCADE CONSTRAINT ]; Code language: SQL (Structured Query Language) (sql)

When to recompile a view in alter view?

You may want to recompile a view explicitly after altering one of its base tables to ensure that the alteration does not affect the view or other objects that depend on it. You can also use ALTER VIEW to define, modify, or drop view constraints.

When to use the alter View statement in Java?

Use the ALTER VIEW statement to explicitly recompile a view that is invalid or to modify view constraints. Explicit recompilation lets you locate recompilation errors before run time.