In SQL, which of the following statements about the views is true?
Views do not store data in a physical location.
Views can be used to hide some of the columns from a table.
Views can provide access restriction
All of these
Answers
Answer:
Views could be looked as an additional layer on the table which enables us to protect intricate or sensitive data based upon our needs
Answer:
D) All of above
Explanation:
A View is a virtual table in SQL. It contains rows and columns just like any other table. The fields in a view are from one or more tables in the database. Views in SQL is used for security purposes because they provide encapsulation of the name of the table. It is also used to hide rows and columns. We can use view to limit the data that a user is allowed to see in a table. Various uses of views are:- Restricting data access, Hiding data complexity, Simplify commands for the user, Store complex queries, Rename Columns, etc.
Three types of system defined views are:-
1. Information Schema
2. Catalog View, and
3. Dynamic Management View.
Hence all the statements are true.
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