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What is the most common type of transmission media used in computer networks?
Copper cables
Fiber optic cables
Wireless signals
Satellite communication
What is a view in SQL?
A virtual table that is based on the result of an SQL statement
A physical table that stores data permanently
A temporary table used for sorting data
A table that contains only primary key columns
Which of the following statements about views in SQL is true?
Views can be used to simplify complex queries
Views can be updated like regular tables
Views can improve performance by storing precomputed results
Views can only retrieve data from a single table
Views can have indexes for faster access
Which of the following are examples of guided transmission media?
Coaxial cables
Twisted pair cables
Microwave signals
Infrared signals
Optical fibers
What is the maximum data transfer rate of a Category 6 Ethernet cable?
10 Gbps
1 Gbps
100 Mbps
10 Mbps
Which SQL statement is used to create a view?
CREATE VIEW
INSERT INTO
SELECT INTO
ALTER TABLE
What is the purpose of using aliases in a view?
To provide alternative names for columns or tables
To hide the underlying table structure
To restrict access to certain columns
To improve query performance
Which of the following is an advantage of fiber optic cables over copper cables?
Higher bandwidth
Immunity to electromagnetic interference
Lower cost
Easier installation
Longer maximum distance
What is the main disadvantage of wireless transmission media?
Limited range
High cost
Susceptibility to interference
Low data transfer rate
Which of the following statements about updating views in SQL is true?
Views can be updated if they meet certain criteria
Views cannot be updated under any circumstances
Updates to views are automatically propagated to the underlying tables
Updates to views require explicit INSERT, UPDATE, or DELETE statements
What is the purpose of using the DROP VIEW statement in SQL?
To remove a view from the database
To delete data from a table
To truncate a table
To drop all views in the database
Which of the following is an example of unguided transmission media?
Radio waves
Microwave signals
Coaxial cables
Optical fibers
Infrared signals
What is the purpose of a repeater in a network?
To regenerate and amplify signals
To connect multiple devices
To provide security
To route data packets
Which of the following statements about materialized views in SQL is true?
Materialized views store the actual data in a physical table
Materialized views are automatically updated when the underlying data changes
Materialized views can improve query performance by precomputing results
Materialized views cannot be queried like regular views
Materialized views are only available in certain database systems
Which SQL statement is used to refresh a materialized view?
REFRESH MATERIALIZED VIEW
UPDATE VIEW
ALTER TABLE
SELECT INTO
Which type of transmission media is immune to electromagnetic interference?
Fiber optic cables
Coaxial cables
Twisted pair cables
Wireless signals
What is the maximum data transfer rate of a USB 3.0 cable?
5 Gbps
480 Mbps
12 Mbps
1 Mbps
What is the purpose of using the WITH CHECK OPTION clause when creating a view?
To ensure that only rows satisfying the view's filter conditions can be inserted or updated
To prevent any modifications to the view
To specify the join conditions between multiple tables in the view
To improve query performance for the view
Which of the following statements about views in SQL is false?
Views can be used to enforce security by restricting access to certain columns
Views can be used to simplify complex queries
Views can be used to encapsulate complex logic
Views can be used to store data permanently
Which of the following is an example of a wireless transmission media?
Bluetooth
Ethernet cables
Fiber optic cables
Satellite communication
Wi-Fi
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