Update view sql

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All views are not updatable. So, UPDATE command is not applicable to all views. An updatable view is one which allows performing a UPDATE command on itself without affecting any other table. A view contains rows and columns, just like a real table.

SQL CREATE VIEW Statement. The fields in a view are fields from one or more real tables in the database. When a view is created by using WITH VIEW _METADATA, all its columns, except a timestamp column, are updatable if the view has INSERT or UPDATE INSTEAD OF triggers. Views don’t necessarily exhibit the same capability.

If you update a view, you’re actually updating its underlying table. Here are a few potential problems you may encounter. Modify Data Through a View.

When modifying data through a view (that is, using INSERT or UPDATE statements) certain limitations exist depending upon the type of view. Views that access multiple tables can only modify one of the tables in the view. Is a view in the database updatable ? How to add new column in existing View in SQL. Can we update real data in views ? 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. The OUTPUT clause is not supported in any DML statements that target remote tables or views.

If you create a view with the TEMPTABLE algorithm, you cannot update the view. Note that it is sometimes possible to create updatable views based on multiple tables using an inner join. Let’s create an updatable view.

First, we create a view named officeInfo based on the offices table in the sample database. My theriy is that since you can only update one table in a view at a time and you therfore need to know which field views are in which table, it makes no sense not to directly update the tables. The exceptions would be when you are using views to restrict the user to a subset of the data in one table. Then it makes sense to update through the view.

I have created a view that is based on another view and a table. I want to add new column of type varchar. I did like below, But getting syntax error? A view is written to fetch data from the various tables based on joins and where conditions put. View is just a logic put in place which gives the desired data set on invoking it.

But not sure on what scenario one needs to update a view. If the view exists it will be replaced with the new definition or a new view will be created. We can use Create or Replace option to create views instead of dropping the view and recreating it, as with this option the privileges granted on the view are preserve but the dependent stored programs and view become invalid.

Although such a view is not insertable, it can be updatable if you update only columns that are not expressions. But it is updatable if the update does not try to update col2. You can modify the definition of an Oracle VIEW without dropping it by using the Oracle CREATE OR REPLACE VIEW Statement.