<?php
	/*

	Template Name: myTemp

	*/

		global $wpdb;

		if(isset($_GET['search-custom-table']) && $_GET['search-custom-table'] != '') {
				$user_search = esc_attr($_GET['search-custom-table']);
				$address_table = $wpdb->prefix . "address_table";
				$myrows = $wpdb->get_var( 'SELECT city FROM ' . $address_table );
				global $myrows;
		}

		var_dump($myrows);

	  ?>

      <form method="get" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
      	<input type="text" name="search-custom-table" id="search-custom-table" />

        <input type="submit" class="" value="Search" />
      </form>