Updating an oracle view dating in ucraine

It is sometimes possible for a multiple-table view to be updatable, assuming that it can be processed with the value for a view has become inaccurate to due to changes to underlying views, the value can be updated by deleting and recreating the view.The updatability of views may be affected by the value of the CREATE TABLE t1 (x INTEGER); CREATE TABLE t2 (c INTEGER); CREATE VIEW vmat AS SELECT SUM(x) AS s FROM t1; CREATE VIEW vup AS SELECT * FROM t2; CREATE VIEW vjoin AS SELECT * FROM vmat JOIN vup ON vmat.s=vup.c; Additional discussion and examples follow.Generally, the view references must be updatable, meaning that they may be merged and not materialized. For a view to be updatable, there must be a one-to-one relationship between the rows in the view and the rows in the underlying table.

A view contains rows and columns, just like a real table.

To be more specific, a view is not updatable if it contains any of the following: .

For information about generated columns, see Section 13.1.18.8, “CREATE TABLE and Generated Columns”.

CREATE OR REPLACE VIEW customer_projects_view AS SELECT cust.customer_id, cust.customer_name, cust.country, projectdtls.project_id, projectdtls.project_name, projectdtls.project_start_Date FROM customer_details cust, projects_details projectdtls WHERE cust.customer_id = projectdtls.customer_id; INSERT INTO customer_projects_view VALUES (1,'XYZ Enterprise','Japan',101,'Library management',sysdate); -- output SQL Error: ORA-01779: cannot modify a column which maps to a non key-preserved table 01779.

00000 - "cannot modify a column which maps to a non key-preserved table" *Cause: An attempt was made to insert or update columns of a join view which map to a non-key-preserved table.

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