Create a table in custom plugin on the activating it?

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You have to include wpadmin/upgrade-functions.php file to create a table
example 

function create_plugin_database_table()
{
    global $table_prefix, $wpdb;

    $tblname="pin";
    $wp_track_table = $table_prefix . "$tblname ";

    #Check to see if the table exists already, if not, then create it

    if($wpdb->get_var( "show tables like '$wp_track_table'" ) != $wp_track_table) 
    {

        $sql = "CREATE TABLE `". $wp_track_table . "` ( ";
        $sql .= "  `id`  int(11)   NOT NULL auto_increment, ";
        $sql .= "  `pincode`  int(128)   NOT NULL, ";
        $sql .= "  PRIMARY KEY `order_id` (`id`) "; 
        $sql .= ") ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ; ";
        require_once( ABSPATH . '/wp-admin/includes/upgrade.php' );
        dbDelta($sql);
    }
}

 register_activation_hook( __FILE__, 'create_plugin_database_table' );

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