WHERE Statement: “WHERE” statement is used limit the number of rows. For example:Consider a table “FTable” that has two columns named “FruitName” and “Color”. “WHERE” clause is used when there is a need to display the entire FruitName whose color is Red. SELECT * FROM FTable WHERE color = 'red'; When the above statement is executed, red colored fruits get displayed. “EXISTS” operator: In SQL, “EXISTS” operator is used to test whether the record is present in the subquery. This “EXISTS” operator returns “true” if the subquery returns one or more records. Syntax: SELECT column_Name(s) FROM table_Name WHERE EXISTS (SELECT column_Name FROM table_Name WHERE condition);

Question

If a UDP datagram is sent from host A, port P to host B, port Q, but at host B there is no process listening to port Q, then B is to send back an ICMP Port Unreachable message to A. Like all ICMP messages, this is addressed to A as a whole, not to port P on A. (a) Give an example of when an application might want to receive such ICMP messages. (b) Find out what an application has to do, on the operating system of your choice, to receive such messages. (c) Why might it not be a good idea to send such messages directly back to the originating port P on A?

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Question

Chapter 5, Problem 5TD

Program Plan Intro

WHERE Statement:

“WHERE” statement is used limit the number of rows. For example:Consider a table “FTable” that has two columns named “FruitName” and “Color”. “WHERE” clause is used when there is a need to display the entire FruitName whose color is Red.

SELECT * FROM FTable WHERE color = 'red';

When the above statement is executed, red colored fruits get displayed.

“EXISTS” operator: In SQL, “EXISTS” operator is used to test whether the record is present in the subquery. This “EXISTS” operator returns “true” if the subquery returns one or more records.

Syntax:

SELECT column_Name(s) FROM table_Name WHERE EXISTS (SELECT column_Name FROM table_Name WHERE condition);

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