I can only presume you are waiting for both 'date' and 'correct' to be true before inserting into the DB.

I would agree with earlier comments about your SQL, and ask why you are creating it in a variable and not inserting it? much better to add placeholders...

Presuming you are doing what I think you are, and are waiting for both the date and 'correct' to be true this may help

#!/usr/bin/perl -w

use strict;
use warnings;

my @data_list = (
    {key => 'date', value => '2009-01-01'}, 
    {key => 'correct', value => 'some_data_here'}, 
    {key => 'date', value => '2009-01-02'}, 
    {key => 'correct', value => 'some_data_here_again'}
); # Presumption of your test data based on your code..


my ($cor, $date);
foreach my $data_pair(@data_list) {
    $cor = $data_pair->{value} if($data_pair->{key} eq 'correct');
    $date = $data_pair->{value} if($data_pair->{key} eq 'date');
    if($cor && $date) {
        # SQL Update goes here....
        print "Found a match for $date and $cor\n";    
        # Reset for the next loop
        ($cor, $date) = (undef, undef);        
    }
}
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