I have included some features and still a bit redundant on the condition "if id exists", it is ok for now and open to suggestions.

This is the result:

#!/usr/bin/perl -W

# This script will create multiple csv files based on 
# passed arguments "id" and custom "where" clause. Also,
# in the future it will read and display it as
# floating boxes in an HTML page (D3JS does the trick)

use DBI;
use Text::CSV_XS;


# Constant:
# my $htmlpage = "htmlfile_$id"; #TODO: it will build the html file


# Here are the temporary params (TODO: it will use @ARGV)
# This is an important param because it will run bunch of queries
# just for the provided id, if no id was provided then
# it will run the queries for all ids from the table
my $id = "";


# DBI CONNECTION
my $dbh = get_dbh();


# SUBROUTINES
sub run_query 
{
    my ($sql, $csvfile) = @_;
    print "Running $sql\n";
    
    open my $fh, '>', $csvfile or die "Could not open $csvfile: $!";

    my $csv = Text::CSV_XS->new ({ binary => 1, eol => "\n" });
    my $sth = $dbh->prepare ($sql); 
    $sth->execute;
    $csv->print($fh, $sth->{NAME_lc});
    my $count = 1;
    while (my $row = $sth->fetchrow_arrayref)
    {
        $csv->print($fh, $row);
        ++$count;
    }
    close $fh; 
    
    print "ID: $id, $count lines dumped to $csvfile\n";
}

sub get_dbh
{
    my $dbname = "jtech";
    my $user = "jtech";
    
    my($dbh) = DBI->connect("dbi:IngresII:$dbname","$user","")
    or die "Could not connect to database $dbname\n";
    
    return $dbh;
}



# MAIN PROGRAM

# If the user type an ID it will generate 4 csv files
# that corresponds to each custom SQL query
if ($id)
{

    # In this case it generates reports for the typed "id" only 
    $clause = "id=$id AND";
    
    my @query = (
        ["SELECT id FROM mytable WHERE $clause salary >= 1","csvfile1_
+$id.csv"],
        ["SELECT name FROM mytable WHERE $clause salary >= 1","csvfile
+2_$id.csv"],
        ["SELECT salary FROM mytable WHERE $clause salary >= 1","csvfi
+le3_$id.csv"],
        ["SELECT dept FROM mytable WHERE $clause salary >= 1","csvfile
+4_$id.csv"],
    );
    
    for (@query)
    {
        run_query(@$_);
    }
}
# If there is NO ID provided than it will generate csv files
# corresponding to all ids found with a special clause where 
# active ='no' (all IDs will get 4 csv file)
else
{
    # Returns a list of all existents "id" (TO BE UPDATED TO USE DBI)
    my $cmd = `echo 'SELECT DISTINCT id from mytable\\g\\q' | sql jtec
+h -jtech -S | sed -e 's/ //g'`;
    
    foreach $cmd (split /[\n\r]+/, $cmd)
    {
        $id = $cmd;
        
        $clause = "active ='no' AND";
        
        my @query = (
            ["SELECT id FROM mytable WHERE $clause salary >= 1","csvfi
+le1_$id.csv"],
            ["SELECT name FROM mytable WHERE $clause salary >= 1","csv
+file2_$id.csv"],
            ["SELECT salary FROM mytable WHERE $clause salary >= 1","c
+svfile3_$id.csv"],
            ["SELECT dept FROM mytable WHERE $clause salary >= 1","csv
+file4_$id.csv"],
        );
        
        for (@query)
        {
            run_query(@$_);
        }
    }
}
[download]

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