Creating table from wordpress

Hi,

I have written a plugin which will create a table when the plugin is activated. I followed this tutorial :

Creating Table using plugins

When i activate the plugin, it seems the table isn’t getting created.

Following is the code i have written:

global $wpdb;
global $create_table_version;
$create_table_version = “1.0”;

function create_table()
{
	global $wpdb;
	global $create_table_version;

	$table_name = $wpdb->prefix . "url_parse";

	$wpdb->show_errors();

	$sql = "CREATE TABLE $table_name (
	  id mediumint(10) NOT NULL AUTO_INCREMENT,
	  url VARCHAR(60) NOT NULL,
	  tag VARCHAR(60) NOT NULL,
	  UNIQUE KEY id (id)
	);";

	require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
	dbDelta($sql);

	$wpdb->print_error();

	add_option("create_table_version", $create_table_version);

	register_activation_hook(__FILE__,'create_table');
}

I am saying this because when i wrote an insert query to insert a row in the table i got the following error :

WordPress database error: [Table ‘wordpressdb.url_parse’ doesn’t exist]
INSERT INTO url_parse (url,tag) VALUES (‘timesofindia.indiatimes.com’,'<div class=\”Normal\”>’)

I also get an error like for the select query :

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘<div class=”Normal”&gt’ at line 1]
select url,tag from url_parse where url = timesofindia.indiatimes.com and tag = <div class=”Normal”>

My select and insert queries are as follows:

$wpdb->show_errors();

	if($url[url_name] != null && $url[tag_name] != null)
	{
		$results = $wpdb->get_results("select url,tag from url_parse where url = $url[url_name] and tag = $url[tag_name]");
	}
	$wpdb->print_error();
if($results == null)
	{
		$results = $wpdb->insert(
						'url_parse',
						array(
							'url' => $url[url_name],
							'tag' => $url[tag_name]
						)
					);
	}
	$wpdb->print_error();