Correct Answer : null
Explanation : In MySQL, NULL is not comparable to other known values. It will result in a NULL when compared to any value. The following statement would result in four NULLs : ‘SELECT NULL = 0, NULL < 0, NULL <> 0, NULL > 0’.
SELECT NULL = 0, NULL < 0, NULL <> 0, NULL > 0’
Correct Answer : #!
Explanation : The Perl scripts are text files, which can be ceated using any text editor. All Perl scripts generally begin with a #! (shebang) line. A script is a file containing a sequence of commands.
Correct Answer : use CGI
Explanation : In order to write a Perl script that uses the ‘CGI.pm’ module, a ‘use CGI’ statement is included near the beginning of the script that imports the function names of the module.
Correct Answer : Common Gateway Interface
Explanation : The ‘CGI.pm’ module is so called because it helps write scripts that use the ‘Common Gateway Interface’ protocol which defines how a web server communicates with other programs.
