Does dropping a view drop the table?
However, with by dropping a view, the original data is unaffected. This is why the View is such a great tool for end users in the first place: the table behind the scenes is safe.
How do I drop a view in a table?
The syntax for the SQL DROP VIEW Statement is: DROP VIEW view_name; view_name. The name of the view that you wish to drop.
What happens to view when table is dropped in SQL Server?
Dropping a table removes the table definition from the data dictionary. All rows of the table are no longer accessible. All indexes and triggers associated with a table are dropped. All views and PL/SQL program units dependent on a dropped table remain, yet become invalid (not usable).
How do I drop a column in view?
You cannot use ALTER VIEW for removing a column. To recreate the view without the column, use CREATE OR REPLACE VIEW . From the Oracle documentation: Use the ALTER VIEW statement to explicitly recompile a view that is invalid or to modify view constraints.
What happens if you drop a table on which a view exists?
If a table is dropped and there are associated views, stored procedures or functions that were created without schema binding, then stored procedures, functions, and views will still exist but will no longer work.
What happens to the data associated with a view when the view is dropped?
Remarks. When you drop a view, the definition of the view and other information about the view is deleted from the system catalog. All permissions for the view are also deleted. Any view on a table that is dropped by using DROP TABLE must be dropped explicitly by using DROP VIEW.
How do I drop a view in Oracle?
To remove a view from the database, you use the following DROP VIEW statement:
- DROP VIEW schema_name.view_name [CASCADE CONSTRAINT];
- CREATE VIEW salesman AS SELECT * FROM employees WHERE job_title = ‘Sales Representative’;
- SELECT * FROM salesman;
Which command is used to drop a view?
If you want to delete a SQL view, It is done by SQL DROP command you should use the following syntax: SQL DROP VIEW syntax: DROP VIEW view_name.
When you drop the base table view becomes inactive?
When table is dropped or modified, view becomes inactive, it depends on the table objects. Not all the time we can perform DML statements, as normally views are made for complex query and depends on more than one table.
What happens if you drop a table that doesn’t exist?
The DROP TABLE statement deletes the specified table, and any data associated with it, from the database. The IF EXISTS clause allows the statement to succeed even if the specified tables does not exist. If the table does not exist and you do not include the IF EXISTS clause, the statement will return an error.
What does drop view mean?
How do I drop a view in MS SQL?
Syntax
- — Syntax for SQL Server and Azure SQL Database DROP VIEW [ IF EXISTS ] [ schema_name . ] view_name [ …,n ] [ ; ]
- — Syntax for Azure Synapse Analytics DROP VIEW [ IF EXISTS ] [ schema_name . ] view_name [ ; ]
- — Syntax for Parallel Data Warehouse DROP VIEW [ schema_name . ]
- DROP VIEW IF EXISTS dbo.Reorder ; GO.
How do you create a drop command in SQL?
A DROP statement in SQL removes a component from a relational database management system (RDBMS). Syntax: DROP object object_name Examples: DROP TABLE table_name; table_name: Name of the table to be deleted. DROP DATABASE database_name; database_name: Name of the database to be deleted.
What is column drop?
The DROP COLUMN command is used to delete a column in an existing table.
How do I drop a specific column in SQL?
Step 1: Go to the Databases -> Tables menu and expand it. Step 2: Select the desired table and expand it. Step 3: Select the Columns and expand them. Step 4: Right-click on the column name you want to remove and choose the Delete option.
What happens if view is dropped?
If a VIEW, by definition of a view, is a subset of that which is in the database (whether on one or more tables), then if you drop even one of those tables then then VIEW becomes invalid. Therefore according to database logic such a View cannot exist. (All the data in that table is ‘destroyed’ on dropping).