I have two deep hashes (represented below) - I want to compare the two against each other to create a database difference report. So when I'm finished (against the code below), I would know that I have two column diffs between them ('SOME_DATE' has different type and 'CYCLE_DATE' has different nullable values), as well as I have an extra column in the second hash. I've been using the examples here to walk through the hashes, but I can't see how to effectively compare them / place all the differences into a third array/hash: "differences". Thank you for any/all help that you can provide! 
#!/usr/bin/perl -w

use strict;
use Data::Dumper;
my %hash = (
    TABLE_NAME => {
        COLUMN_NAME => {
            'CYCLE_DATE' => { TYPE => 'VARCHAR2(20)', NULLABLE => 'N' 
+},
            'SOME_DATE'  => { TYPE => 'DATE',         NULLABLE => 'N' 
+},
            'AMITRUE'    => { TYPE => 'BOOLEAN',      NULLABLE => 'N' 
+}
        }
    }
);

my %hash2 = (
    TABLE_NAME => {
        COLUMN_NAME => {
            'CYCLE_DATE' => { TYPE => 'VARCHAR2(20)', NULLABLE => 'Y' 
+},
            'SOME_DATE'  => { TYPE => 'SOMEGUY',      NULLABLE => 'N' 
+},
            'AMITRUE'    => { TYPE => 'BOOLEAN',      NULLABLE => 'N' 
+},
            'THE_DUDE'   => { TYPE => 'VARCHAR2(10)', NULLABLE => 'Y' 
+}
        }
    }
);

# works for walking single hash - have just started 
# trying to figure out how I'd do both.
walk_hash(\%hash, \%hash2);

sub walk_hash { 
    my ($h1, $h2) = shift; 
    foreach my $key (keys %$h) { 
        if( ref $h->{$key}) { 
            walk_hash( $h->{$key} );
        } 
        else { 
            print $h->{$key};
        } 
    } 
}

[download]

In reply to Comparing two deep hash of hashes by TJRandall

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.