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what is ment by view?how many types are there ?what are
they?and what is the difference between data base view and
projection view?
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Answer Posted / srinivasan
There are 4 types of views: Database view, projection View,
Maintenance view and Help View
Data base view implement Inner join whereas Maintenance
view and Help view implement outer join
projection views can be created only on single table
select condition cannot be specified for projection views
since the database view is implemented on a database, only
transparent table can be used to create them
it is possible to access pooled and cluster table using
projection view
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