What are the advantages of VIEW?




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What are the advantages of VIEW?..

Answer / vinay dixit

please find the advantages as given below :-

a) data security - no need to give permission on the table,
infact a view can be created, having only selected number
of coloums in its definition. So user will only be able to
see those coloums.

b) simplicity - a very complicated query can be saved as a
view defenition. when needed can be called by its view name.

c) removes dependency - Can be very helpful to remove the
dependecny from the underlying tables. Suppose a view is
created by joining several tables. After some time, there
are some changes on the tables, so only defenition of view
can be changed and there is no need to change all the code
where view is used.

d) No space - takes no space ( except materialized view )

Is This Answer Correct ?    60 Yes 4 No

What are the advantages of VIEW?..

Answer / anil_abbireddy

1. data security : complex view can not be modified ie.
base tables cannot be visible.
2. it provides easy way to query data from different data
sources like a single table
3.it is very usefull when developing complex reports basing
on multiple tables.

Is This Answer Correct ?    38 Yes 4 No

What are the advantages of VIEW?..

Answer / pnc

view is a logical presentation of one or more tables. It is
a virtual table. or A view is a data base object to register
the select statement permanently in the data base.

Is This Answer Correct ?    17 Yes 6 No




What are the advantages of VIEW?..

Answer / karunakarreddy.boyapally

1) it reduse the object size
2) hides the complexity of data
3) security purpose also

Is This Answer Correct ?    12 Yes 3 No

What are the advantages of VIEW?..

Answer / kapil syscom

View is simple structure as table in database, it dosen't take extra memory space, and reduces the structural complexity of database whenever we need to fetch the data from more than one table, thus it reduces the cost of joins every time.
Thus these is true that we have to use it for efficiency reasons..

Is This Answer Correct ?    5 Yes 5 No

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Hi, I am new in oracle(SQL), could anyone help me in writing a correct SQL. Below is the table structure. Table: Subsc Fields: 1. Sub_no (this field will hold values of subscriber nos, for e.g. S111111, S222222, S333333, S444444, etc.) 2. s_status (this field will hold values for different status of subscriber, for e.g. 'A', 'S', 'C', etc.) 3. cus_id (this field will hold values of bill nos for e.g. 11111111, 22222222, 33333333, 44444444, etc.) Table: Bill Fields: 1. Bill_no this field will hold values of bill nos for e.g. 11111111, 22222222, 33333333, 44444444, etc.) 2. b_status = (this field will hold values for different status of bill for e.g. 'O', 'C', 'S', etc.) Note: 1. The Sub_no is a Primary key of Subsc table. 2. The cus_id is a foreign in Subsc table (referred from Bill_no field of Bill table) 3. The Bill_no field is the Primary key of Bill table. Query A --> I wrote a query to select cus_id/Bill_no which is in status open (b_status = 'O') and having more than two active subscriber (i.e. S_status = 'A') in it ( i.e. more the two subscribers in same bill). select s.cus_id from subsc s where exists (select 1 from bill where bill_no = s.cus_id and b_status = 'O') and s_status = 'A' group by s.cus_id having count(sub_no) = 2 Problem : The above query will give the cus_id (or rather bill_no) which are in open status (b_status ='O) and which are having TWO ACTIVE Subscribers (s_status ='A') in it. However, this query will also lists the cus_id/bill_no which are having more than TWO subscribers in it (but only two subscriber will be in Active status (s_status = 'A') and the others will be in s_status = 'C' or s_status = 'S'. Help needed: I want to write a query which will fetch ONLY the cus_id/bill_no which are in open status (b_status ='O') and which are having ONLY TWO ACTIVE subscribers (s_status ='A') in it. B--> If I include the sub_no in the above query then NO row are returned. select s.cus_id, s.sub_no from subsc s where exists (select 1 from bill where bill_no = s.cus_id and b_status = 'O') and s_status = 'A' group by s.cus_id, s.sub_no having count(sub_no) = 2 Help needed: I want to modify the above query which will fetch ONLY the cus_id/bill_no which are in open status (b_status ='O') and which are having ONLY TWO ACTIVE subscribers (s_status ='A') in it ALONG with the sub_no. Thanks a lot in advance. Regards, Nitin

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