When I create a hash reference and then try to add values to undefined keys, can I add a different value to key1 and key2 at the same time?

Something like this, except it doesn't work: 

$hashref->{"key1"} = "value1", {"key2"} = "value2";

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This seems like it should be simple and if the answer is in perlreftut or perldsc (or anywhere else) please give me a big clue because the many attempts I've made just aren't working.

I don't really have a burning need, just trying to learn about references and hashes.
I can only add the values one at a time, as my example below demonstrates 

use strict;
use warnings;

my %employees=  ( "key1"   => undef,
                  "key2"   => undef,
                  "key3"   => undef,
                 );

my $hashref = \%employees;
$hashref->{"key1"} = "value1";
$hashref->{"key2"} = "value2";
$hashref->{"key3"} = "value3";

print %$hashref,"\n";

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In reply to Assigning values to undef hash reference keys two or more at a time by gctaylor1

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