Oracle view definition

Use the CREATE VIEW statement to define a view , which is a logical table based on one or more tables or views. A view contains no data itself. My issue is I have a custom SQL runner hitting an Oracle , readonly db.

I want to get the definition of a view. A max of so many characters, maybe 100. All the views are longer than this. How to retrieve the SQL used to create a view in.

Views lösen viele praktische Probleme, da sie zum einen SELECT-Abfragen überflüssig machen können, oder den Zugriff auf eine Tabelle einschränken können, um Spalten für Anwender zu verbergen. Eine View speichert selber jedoch keine Daten, sondern wendet nur das SQL-Statement an, das bei der View - Definition hinterlegt wurde. I understand that you could alias the columns in the view definition to change the name of the column in the view. Alternative (and better) way is to use GET_DDL() function of metadata package DBMS_METADATA.

SQL statement stored in the database in the system tablespace? ALL_ VIEWS describes the views accessible to the current user. DBA_ VIEWS describes all views in the database. USER_ VIEWS describes the views owned by the current user. This view does not display the OWNER column.

At runtime, Oracle looks-up this definition in the data dictionary and executes the SQL. This Oracle explains how to create, update, and drop Oracle VIEWS with syntax and examples. The default is much lower. An Oracle VIEW , in essence, is a virtual table that does not physically exist. Rather, it is created by a query joining one or more tables.

If you give this query a name, then you have a view. So by definition , a view is a “virtual” table whose data is the result of a stored query, which is derived each time when you query against the view. Oracle dynamically compiles the invalid view if you attempt to use it. When a view is droppe all grants of corresponding view privileges are revoked from roles and users.

Materialized Views (MAV), die bereits seit der Version Oracle 8i zur Verfügung stehen, sind ein gern genutztes Tuningmittel in Datawarehouse-Umgebungen. Ein Zugriff auf diese materialisierte View ist erheblich. But need to use only SQL PLUS not any tool. Please let me know how cani see the full definitio of the view by SQL PLUS.

Because when you use the DROP VIEW and CREATE VIEW to change the view ’s definition , Oracle removes the view privileges, which may not be what you want. Views werden mit dem Befehl CREATE VIEW mit folgender Syntax angelegt. To avoid this, you can use the CREATE OR REPLACE clause that preserves the view privileges.

Usually, you create a new view based on existing tables. However, sometimes, you may want to. Neben den herkömmlichen Sichten gibt es noch so genannte materialisierte Sichten (englisch materialized views ), auch Indexed Views oder Automatic Summary Tables genannt.

Diese sind in der Datenbank abgelegte Kopien von Sichten (Master Sites) zu einem bestimmten Zeitpunkt.