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while ($book_id = $sth->fetchrow_array()) {
    $booklist_1{$book_id} = 1;
}

$sql = "select update_id, title from booklist_table where (book_id = ?
+) order by update_id desc limit 1";
$sth = $dbh->prepare($sql) or die("Could not prepare!" . $dbh->errstr)
+;
...
    print "$book_id > $booklist_1{$book_id}{'update_id'}\n";
}
$sth->finish;

$sql = "SELECT book_id FROM booklist_table WHERE (expected_publcn_date
+ >= '".$start_date."' AND expected_publcn_date <= '".$end_date."')";
$sth = $dbh->prepare($sql) or die("Could not prepare!" . $dbh->errstr)
+;
...
    print "$book_id > $booklist_1{$book_id}{'update_id'}\n";
}
$sth->finish;