a view is a virtual table.it's an object that derives it's
data from one or more tables.it ensures that users are able
to retrieve and modify only the data which is seem by them.
u r unable to update attributes becoz views allow only one
of the underlying tables to be updated at a time.u need to
update attributes by giving two separate update commands.
view is a virtual table created from the physical table
which is existing.view can be updated unless the base table
does not have any relation u another table
View is a virtual table,created by users for their own
convienience.
views can be updated as required but the updated data will
not reflect in the base table, since view is the virtual
table not the original table.
so, if we want to update the table we have to update that
outside the view or directly but not using view.
if we update through view its temporary means just in the
view only but will not reflect in the base table.
You can modify data by using a view in only one of its base
tables even though a view may be derived from multiple
underlying tables. For example, a view vwNew that is
derived from two tables, table and table2, can be used to
modify either table or table2 in a single statement. A
single data modification statement that affected both the
underlying tables is not permitted
View is sub set of one or more then one tables
View is use to fetch the selected columns from one more
then one tables.
Yes we can update the view if it is not read only.
View is a taliored representation of data of a particular
table. In one way to say view is a shadow of a table. What
ever U do on a view will reflect on the table vice versa.
Views r 2 types simple and complex simple is selected rows
from one table and complex is selected from more than one.
In oracle complex view can be updated by using instead of
triggers from version 8.0
could you please reply for these question:
1.About Use Apply?
2.Avoid cursors - When we have a situation that we can not
avoid the use of cursor than what is the alternate solution?
is there anything we can use instead of cursor to perform
the desired task? which optiomize the peroformance too.
3.What is computed columns?
Thanks in advance.
Regards,
Rupesh
CREATE TABLE [dbo].[HPMS_CompetencyTypes](CompetencyType
varchar(50) )
go
create trigger hpms_create_Insert
on HPMS_CompetencyTypes
for insert
as
if Exists ( select * from [HPMS_CompetencyTypes] where
CompetencyType=(select * from [HPMS_CompetencyTypes]))
begin
Rollback tran
Raiserror ('duplicate value',12,6)
go
insert HPMS_CompetencyTypes (CompetencyType) values ('new')
I'm new to trigger can any one tell me where is the issue.
Please.
hi,
i have a table called names and field name
select * from names
name
a
b
c
d
i want to display like this
name
a,b,c,d
how it is possible
Regards
Baiju
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