how to write update,insert,delete in View

You can't create a view as an Update, you need to create the view as a Select.

You can only perform the Update, Delete and Insert if the view Select contains one table:

Create View MyView As
SELECT * Customers WHERE Age > 18
/*Can update*/

Create View MyView As
SELECT * Customers, CustomerAddress WHERE Age > 18
and 
customer.Id = CustomerAddress.Id
/*Cannot update*/

Additionally, you can only perform an insert where enough columns in the view are specified to satisfy any not null constraints.

As a side note, it looks like you are trying to set default values in your question, is this really what you want instead?

[Corrected code formatting]