Use strict and warnings!!! 

use Data::Dumper;

my %booklist_l;
$booklist_l{ 'foo' } = 1;
$booklist_l{ 'bar' } = 1;

$booklist_l{ 'foo' }{ 'update_id' } = 'update_id 1';
$booklist_l{ 'foo' }{ 'title' } = 'title 1';

$booklist_l{ 'bar' }{ 'update_id' } = 'update_id 2';
$booklist_l{ 'bar' }{ 'title' } = 'title 2';

print Dumper \%booklist_l;
print Dumper \%1;
__END__
$VAR1 = { 
          'bar' => 1,
          'foo' => 1
        };
$VAR1 = { 
          'update_id' => 'update_id 2',
          'title' => 'title 2'
        };

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That number '1' you put into every entry is being treated as a symbolic reference to the variable %1.

In reply to Re^3: Why is my code assigning the last-retrieved value to all elements in my hash? by kyle
in thread Why is my code assigning the last-retrieved value to all elements in my hash? by punch_card_don

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