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$sql = "select update_id, title from booklist_table where (book_id = ?
+) order by update_id desc limit 1";
...
foreach $book_id (keys %booklist_1) {
    print "XXX $book_id > $booklist_1{$book_id}{'update_id'}\n";
}

100 > 456
101 > 753
...
XXX 101 > 259
XXX 102 > 259
XXX 103 > 259