You can update view in MySQL
using ALTER statement
. This will replace the SQL query for view, not underlying data.
Can MySQL views be updated?
You can update view in MySQL
using ALTER statement
. This will replace the SQL query for view, not underlying data.
Does view update automatically MySQL?
Yes, Views automatically update in MySQL
; including, but not limited to: Changing table structures. Insert/Update/Delete procedures on Tables. Changing View structures using CREATE OR REPLACE VIEW.
Can a database view be updated?
Yes, they are updatable but not always. Views can be updated under followings: If the view consists of the primary key of the table based on which the view has been created.
If the view is defined based on one and only one table
.
How do I edit a view in MySQL?
- Click on your View in table list.
- Click on Structure tab.
- Click on Edit View under Check All.
Which types of views Cannot be updated?
What types of database views cannot be updated? You cannot update views that involve
statistics and views with joins of nonprimary key columns
. Updates for these types of views must be made in the base table. Use the DROP VIEW command to delete a view.
What Cannot be done on a view?
What cannot be done on a view? Explanation: In MySQL, ‘
Views’ act as virtual tables
. It is not possible to create indexes on a view. However, they can be used for the views that are processed using the merge algorithm.
How often does a SQL view update?
6 Answers. Yes, they are updated,
every time you use them
.
Which views are updatable?
An updatable view is a
special case of a deletable view
. A deletable view becomes an updatable view when at least one of its columns is updatable. A column of a view is updatable when all of the following rules are true: The view is deletable.
What are after triggers?
An after trigger
runs after the corresponding insert, update, or delete changes are applied to the table
. The WHEN condition can be used in an SQL trigger to specify a condition. If the condition evaluates to true, the SQL statements in the SQL trigger routine body are run.
What happens if we update data in a view?
Using Views to Update Data: ** A view can be used in a query that updates data, subject to a few restrictions. Bear in mind that a view is not a table and contains no data—
the actual modification always takes place at the table level
.
Can I insert data into a view?
Yes, possible to insert
,update and delete to view. view is a virtual table. Same Perform as insert,update,delete query.. A view can be defined as a virtual table or a stored query and the data accessible through a view is not stored in the database as a distinct object.
How many types of views are there?
There are total
four types
of views, based on the way in which the view is implemented and the methods that are permitted for accessing the view data. They are – Database Views, Projection Views, Maintenance Views, and Helps Views,.
Can we rename view in MySQL?
In MySQL, views and tables share the same namespace. Therefore,
you can use the RENAME TABLE statement to rename a view
.
How do I change views?
- In Object Explorer, click the plus sign next to the database where your view is located and then click the plus sign next to the Views folder.
- Right-click on the view you wish to modify and select Design.
How do I change the definition of a 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.
