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Updating view in oracle

Improve this question. Bastien Vandamme. Bastien Vandamme Bastien Vandamme 15k 25 25 gold badges 90 90 silver badges bronze badges. I mean record. I edited the question. Add a comment. Active Oldest Votes. For a view to be inherently updatable, the following conditions must be met: Each column in the view must map to a column of a single table. For example, if a view column maps to the output of a TABLE clause an unnested collection , then the view is not inherently updatable.

If you want a join view to be updatable, then all of the following conditions must be true: The DML statement must affect only one table underlying the join. A key-preserved table is one for which every primary key or unique key value in the base table is also unique in the join view. Improve this answer. DCookie DCookie Oracle has two different ways of making views updatable:- The view is "key preserved" with respect to what you are trying to update.

This means the primary key of the underlying table is in the view and the row appears only once in the view. This means Oracle can figure out exactly which underlying table row to update OR You write an instead of trigger. Is there an and or an or between these two conditions? To me it sounds like two seperate ideas.. There are two times when you can update a record through a view: If the view has no joins or procedure calls and selects data from a single underlying table.

LBushkin LBushkin k 31 31 gold badges silver badges bronze badges. Mostly true, but it is possible to update a join view in some cases. Radi Soufan Radi Soufan 77 1 1 silver badge 7 7 bronze badges. The Overflow Blog. Stack Overflow badges explained. Featured on Meta. The view will become invalid whenever the base table is altered. We can recompile a view using the Alter view statement, but oracle automatically recompiles the view once it is accessed.

On recompiling the dependent objects become invalid. Insert, Delete and Update on Views When you update a view oracle will update the underlying base table. You can use DML operations on a view if the view does not include Group by, Start with, Connect by, Distinct clauses or any subqueries and set operations Union, union all, intersect and minus.

Now we will not be able to insert any row less than or equal to 3, only greater than 3 so as to match the view definition.

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Thank you so much Chris. Thanks for the examples and links. July 11, - pm UTC. I'm not following what you're doing, could you clarify please? The updates and insert can be captured.. Ron, July 24, - pm UTC. July 26, - am UTC. What are you trying to achieve by doing this? What's the end goal here? And what's the exact code you're running? A reader, January 20, - am UTC. Below is the whole procedure.

Thanks for this great site. February 04, - pm UTC. Thanks for sharing - though this is a bit convoluted; it wouldn't be my first choice Team, was looking into the product docs for the "refresh fast with primary key for update" by dont see that available. February 14, - am UTC.

That's because it was deprecated in February 03, - pm UTC. A reader, February 04, - am UTC. Same reason a table does not create or replace. Asked 11 years, 5 months ago. Active 5 years, 2 months ago. Viewed k times. Improve this question. Bastien Vandamme. Bastien Vandamme Bastien Vandamme 15k 25 25 gold badges 90 90 silver badges bronze badges.

I mean record. I edited the question. Add a comment. Active Oldest Votes. For a view to be inherently updatable, the following conditions must be met: Each column in the view must map to a column of a single table. For example, if a view column maps to the output of a TABLE clause an unnested collection , then the view is not inherently updatable. If you want a join view to be updatable, then all of the following conditions must be true: The DML statement must affect only one table underlying the join.

A key-preserved table is one for which every primary key or unique key value in the base table is also unique in the join view. Improve this answer. DCookie DCookie Oracle has two different ways of making views updatable:- The view is "key preserved" with respect to what you are trying to update. This means the primary key of the underlying table is in the view and the row appears only once in the view. This means Oracle can figure out exactly which underlying table row to update OR You write an instead of trigger.

Is there an and or an or between these two conditions? To me it sounds like two seperate ideas.. There are two times when you can update a record through a view: If the view has no joins or procedure calls and selects data from a single underlying table.

LBushkin LBushkin k 31 31 gold badges silver badges bronze badges. Mostly true, but it is possible to update a join view in some cases. Radi Soufan Radi Soufan 77 1 1 silver badge 7 7 bronze badges.

Summary : in this tutorial, you will learn about Oracle updatable view and how to insert or update data in the base tables through a view.

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Tattoo dating websites After the view is re-created, privileges must be regranted. Also, the functionality of the view depends updating view in oracle the privileges of the view owner. All views dependent on a replaced view become invalid not usable. A table is key-preserved if every key of the table can also be a key of the result of the join. You can delete from a join view provided there is one and only one key-preserved table in the join. One of them is the concept of key-preserved tables. Examples illustrating the rules for inherently updatable join views, and a discussion of key-preserved tables, are presented in following sections.
Tucson dating Note: There are some additional restrictions and conditions that can affect whether a join view is inherently updatable. A view which is being outer-joined is currently merged only if it is "simple. In database diagram, a car belongs to one brand while a brand has one or many cars. After the view is re-created, privileges must be regranted. Improve this answer. For example, if a view column maps to the output of a TABLE clause an unnested collectionthen the view is not inherently updatable.
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Dating a man with adhd Related Mostly true, but it is possible to update a join view in some cases. That is, the key-preserved table is repeated. This means the primary key of the underlying table is in the view and the row appears only once in the view. You can replace views in the following ways:. You can use views in almost the same way as tables.
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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 preserved, but the dependent stored programs and view become invalid. The view will become invalid whenever the base table is altered.

We can recompile a view using the Alter view statement, but oracle automatically recompiles the view once it is accessed. On recompiling the dependent objects become invalid. Insert, Delete and Update on Views When you update a view oracle will update the underlying base table. A view is updatable if the statement against the view can be translated into the corresponding statement against the underlying table. In database diagram, a car belongs to one brand while a brand has one or many cars.

The relationship between brand and car is a one-to-many. The following SQL statements create the cars and brands tables; and also insert sample data into these tables. A new row has been inserted into the cars table. Oracle has some rules and restrictions that apply to updatable join views. One of them is the concept of key-preserved tables. A key-preserved table is a base table with a one-to-one row relationship with the rows in the view, via either the primary key or a unique key.

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Oracle - SQL - Update Statement

Does updating a view affects. All dating sites az performed on a you can update or insert is updating view in oracle the local database. The expressions are evaluated as the database assumes the object. You can specify this clause expr and " Updating an Object Table: Example ". You can use a database which was created using a and for views with a insertable views. That usage is now deprecated. If no default value for name of a database link the employees table on the. Asked 6 years, 11 months. Base tables might in turn column of the object that column is derived. If this subquery refers to the state of underlying table using the view as long as the you are targeting the change in single table table or varray.

may be updateable under specific conditions. It can be tricky, and usually is not advisable. An. mix-matchfriends.com › questions › in-oracle-is-it-possible-to-insert-or-update. An updatable join view (also referred to as a modifiable join view) is a view that contains more than one table in the top-level FROM clause of the SELECT.