if view on based on a single table then u can execute any DML directly on it and can see the changes in the base table

and ifview is based on join of 2 tables then only one base table can be modified at one time so in order to make changes in both the tables use insted of triggers

if the reference to the base table is made then any changes will also affected in base table respect to view table.

yes the changes can be viewed in the base table if and only if the view is on a single base table.

Hi

1) View is like getting information from many tables and displaying the result to the user.
2) If the view is modified it does not effect the base table.
3) If the base tables are modified then it will effect the views it depends on what changes have you performed in the base tabe like dropping columns etc..