What are views in Oracle Database?
An Oracle view is a validated and named SQL query stored in the Oracle Database’s data dictionary. Views are simply stored queries that can be executed when needed, but they don’t store data. It can be helpful to think of a view as a virtual table, or as the process of mapping data from one or more tables.
What is view and types of views in Oracle?
There are 2 types of Views in SQL: Simple View and Complex View. Simple views can only contain a single base table. Complex views can be constructed on more than one base table. In particular, complex views can contain: join conditions, a group by clause, a order by clause.
What is the use of external table in Oracle?
The external tables feature is a complement to existing SQL*Loader functionality. It enables you to access data in external sources as if it were in a table in the database. Prior to Oracle Database 10g, external tables were read-only. However, as of Oracle Database 10g, external tables can also be written to.
Are views stored in database Oracle?
In Oracle, view is a virtual table that does not physically exist. It is stored in Oracle data dictionary and do not store any data. A view is created by a query joining one or more tables.
What are the concepts of external tables in Oracle?
12 External Tables Concepts. The external tables feature is a complement to existing SQL*Loader functionality. It enables you to access data in external sources as if it were in a table in the database. Prior to Oracle Database 10g, external tables were read-only. However, as of Oracle Database 10g, external tables can also be written to.
How to create xmltype views in Oracle Database?
You can also create XMLType views, which are similar to an object views but display data from XMLSchema-based tables of XMLType. Oracle Database Concepts, Oracle Database Application Developer’s Guide – Fundamentals, and Oracle Database Administrator’s Guide for information on various types of views and their uses
What does the CREATE VIEW statement do in Oracle?
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. A view contains no data itself. The tables upon which a view is based are called base tables .
What is the version of the Oracle Database?
Query was executed under the Oracle12c Database version. A. All views accessible to the current user B. If you have privilege on dba_views There are no comments. Click here to write the first comment.