DISTINCT Keyword: “DISTINCT” keyword is used to avoid redundant data (removing duplicate values) from a column. The syntax for “DISTINCT” keyword is as follows: Syntax: SELECT DISTINCT column_Name FROM table_Name; AND Operator: In SQL, “AND” keyword is used in order to check two and more than two conditions. This usually works well with “WHERE” clause. Syntax: SELECT * FROM table_Name WHERE condition1 AND condition2;

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1. Enabled with SSL, HTTPS protocol is widely used to provide secure Web services to Web users using Web browsers on the Internet. How is a secure communication channel established at the start of communication between a Web server running HTTPS and a Web browser? Consider the following threats to Web security and how each of these threats is countered by a particular feature of SSL. Man-in-the-middle attack: An attacker interposes during key exchange, acting as the client to the server and as the server to the client. Password sniffing: Passwords in HTTP or other application traffic are “eavesdropped.” SYN flooding: An attacker sends TCP SYN messages to request a connection but does not respond to the final message to establish the connection fully. The attacked TCP module typically leaves the “half-open” connection around for a few minutes. Repeated SYN messages can clog the TCP module.

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Chapter 5, Problem 10TD

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DISTINCT Keyword: “DISTINCT” keyword is used to avoid redundant data (removing duplicate values) from a column. The syntax for “DISTINCT” keyword is as follows:

Syntax:

SELECT DISTINCT column_Name FROM table_Name;

AND Operator:

In SQL, “AND” keyword is used in order to check two and more than two conditions. This usually works well with “WHERE” clause.

Syntax:

SELECT * FROM table_Name WHERE condition1 AND condition2;

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