Thanks for your reply. I am reading a CSV file(below) and creating a temporary complex hash structure as described to perform some operations. As you can see my $key is the time which should be only one per second and plug the data as hash/array. 
NAME,06/01/2011,09:30:00,16.76,756,Q,00
NAME,06/01/2011,09:30:00,16.76,300,Q,00
NAME,06/01/2011,09:30:00,16.76,100,Q,00
NAME,06/01/2011,09:30:01,16.76,100,Q,00
NAME,06/01/2011,09:30:01,16.76,200,Z,00
NAME,06/01/2011,09:30:02,16.77,200,X,00
NAME,06/01/2011,09:30:02,16.77,200,X,00

[download]

Open 100k line CSV file and read using Text_CSV. I have to undef the hashes before jumping to next second. 
    my $csv = Text::CSV_XS->new();
    open (FILE, "<", "$tickdir/$file") or die "Can't open CSV File:$! 
+\n";

    while (<FILE>) {
        $csv->parse($_);
        my @columns = $csv->fields();
        my $key = str2time($columns[1].' '.$columns[2]);
        my (@prices, @volumes) = ();
        my %HOH = ();

        $HOH{$key}{"name"} = $columns[0];
        push(@{$HOH{$key}{"price"}}, $columns[3]);
        push(@{$HOH{$key}{"volumes"}}, $columns[4]);

        print Dumper(\%HOH);
    }
    close FILE;

[download]
OUTPUT: As you can see the key values are same. 
$VAR1 = {
          '1306935005' => {
                            'volumes' => [
                                           '200'
                                         ],
                            'name' => 'NAME',
                            'price' => [
                                         '16.76'
                                       ]
                          }
        };
$VAR1 = {
          '1306935005' => {
                            'volumes' => [
                                           '400'
                                         ],
                            'name' => 'NAME',
                            'price' => [
                                         '16.76'
                                       ]
                          }
        };

[download]

In reply to Re^2: Hashes of Hashes of Arrays? Is it possible? by capriguy84
in thread Hashes of Hashes of Arrays? Is it possible? by capriguy84

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.