> need to combine two hashes into single hash.

nope, you have a hash of hashes and want to join the second layer hashes with the same first layer keys.

joining hashes is easy %join = (%h1,%h2) (NB: it will eliminate duplicate keys from %h1 though).

what you need is to find the set of all 1st-keys to join the second layer hashes

use strict;
use warnings;
use Data::Dump qw/pp dd/;


my %h1 = (
    'Tim' => {
        'abc' => 7,
        'def' => 7,
        'ghi' => 0
    },
    'Adam' => {
        'abc' => 0,
        'def' => 0,
        'ghi' => 0
    },
    'keas' => {
        'abc' => 0,
        'def' => 0,
        'ghi' => 0
    }
);

my %h2 = (
    'Dav' => {
        'jkl' => 12,
        'mno' => 34,
        'pqr' => 45
    },
    'Adam' => {
        'jkl' => 7,
        'mno' => 0,
        'pqr' => 7
    }
);

my %joined_1st = (%h1,%h2);

#pp \%joined_1st;

my %joined_2nd =
    map { $_ => { %{ $h1{$_} // {} }, %{ $h2{$_} // {} } } }
    keys %joined_1st;

pp \%joined_2nd;
[download]

{
  Adam => { abc => 0, def => 0, ghi => 0, jkl => 7, mno => 0, pqr => 7
+ },
  Dav  => { jkl => 12, mno => 34, pqr => 45 },
  keas => { abc => 0, def => 0, ghi => 0 },
  Tim  => { abc => 7, def => 7, ghi => 0 },
}
[download]

Questions?

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