The Camel Book has a great discussion of Data Structures: Lists of List, Lists of Hashes,
Hashes of Lists, Hashes of Hashes, and points you in the direction of learning more. I
probably read that section at least once a week so it sinks in. Very handy in loading values from
a database where you want to manipulate the values very fast (since hashes are faster and safer than
working with the data in the database directly): 
while (!$recordset->eof) {
     # code to set scalars equal to fields in $recordset
     $hashofrecordset{$id} = { foo => $foo, bar => $bar, baz => $baz, 
+};

}

[download]
     foreach $outerkey ( sort keys %hashofrecordset ) {
          print "\n$hashofrecordset{$outerkey}\n";
          foreach $innerkey ( sort keys %{ $hashofrecordset{$outerkey}
+ }) {
               print "\t$hashofrecordset{$outerkey}{$innerkey}\n";
          }
          print "\n";
     }

[download]
That's the basic idea anyway. take care!

In reply to Re: Data Structures by buzzcutbuddha
in thread Data Structures by Anonymous Monk

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.