Updating a join view oracle


29-Oct-2019 03:04

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Visit Stack Exchange Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. Sign up to join this community CREATE VIEW [dbo].[Claims] AS SELECT mu.

CREATE VIEW sup_orders AS SELECT suppliers.supplier_id, orders.quantity, orders.price FROM suppliers INNER JOIN orders ON suppliers.supplier_id = orders.supplier_id WHERE suppliers.supplier_name = 'Microsoft'; CREATE or REPLACE VIEW sup_orders AS SELECT suppliers.supplier_id, orders.quantity, orders.price FROM suppliers INNER JOIN orders ON suppliers.supplier_id = orders.supplier_id WHERE suppliers.supplier_name = 'Apple'; A VIEW in Oracle is created by joining one or more tables.

When you update record(s) in a VIEW, it updates the records in the underlying tables that make up the View.

So, a view that returns the top 100% by sales would essentially be a sorted view.

The triggers in views are covered later in this chapter.

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Views can be used in place of tables in your Access front-end application, whether you're using an Access database or an Access project.Views can also reference functions and other views.A user can query a single view instead of having to learn complex join syntax and understand the structure of your database.SQL ----------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ----------------------------------------------------------------------------------------------- | 0 | UPDATE STATEMENT | | 4999 | 185K| 30013 (34)| | | 1 | UPDATE | dest_tab | | | | | | 2 | NESTED LOOPS SEMI | | 4999 | 185K| 19 (6)| | | 3 | TABLE ACCESS FULL | dest_tab | 10000 | 332K| 18 (0)| | |* 4 | INDEX UNIQUE SCAN | source_tab_PK | 2500 | 10000 | 0 (0)| | | 5 | TABLE ACCESS BY INDEX ROWID| source_tab | 1 | 43 | 2 (0)| | |* 6 | INDEX UNIQUE SCAN | source_tab_PK | 1 | | 1 (0)| | ----------------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 4 - access("ID"="TT"."ID") 6 - access("ST"."ID"=: B1) UPDATE (SELECT tt.id, tt.code, tt.description, AS st_code, st.description AS st_description FROM dest_tab tt, source_tab st WHERE = st.id) ilv SET = ilv.st_code, ilv.description = ilv.st_description; 5000 rows updated.

Views are saved SELECT statements that allow you to operate on the results that are returned from them.

Columns and rows can be restricted, allowing users to focus on specific data that interests them. This also helps network performance because less data is traveling over the wire to client applications. For example, you could create two views on an Employees table, one with a sensitive salary column included that only managers had permissions on, and a second view with that column omitted for everyone else.