What is a view? Why use it?

Question Posted / babji009

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What is a view? Why use it? ..

Answer / babji009

A view is a virtual table made up of data from base
tables and other views, but not stored separately.
Ex:
CREATE VIEW GOOD1_SUPPLIERS
AS SELECT S#, STATUS, CITY
FROM S
WHERE STATUS > 15;
SELECT * FROM GOOD1_SUPPLIERS;

---------+---------+---------+---------+-----------
SELECT * FROM GOOD1_SUPPLIERS;
---------+---------+---------+---------+-----------
S# STATUS CITY
---------+---------+---------+---------+---
S3 40 PARIS
S4 110 LONDON
S8 30 ATHENS
S7 20 U.S.A

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What is a view? Why use it? ..

Answer / om yadav

after a table is created and populated with data, it may
become necessary to prevent all users from accessing all
column of a table, for data security reasons.
To reduce redundant data to the minimum possible, allows the
creation of an object called VIEW.
Define:= A VIEW is mapped , to a select sentence. The SELECT
clause consists of a sub-set of the columnb of the table.
thus a view , which is mapped to a table, will in effect
have a sub-set of the actual column of the table from which
it is bulit.

This technique offers a simple, effective way of hiding
column of the table.

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