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

     $booklist_1{$book_id} = "ok";