uninstall.php

<?php
/**
 * WooCommerce Uninstall
 *
 * Uninstalling WooCommerce deletes user roles, options, tables, and pages.
 *
 * @author 		WooThemes
 * @category 	Core
 * @package 	WooCommerce/Uninstaller
 * @version     2.1.0
 */
if( ! defined( 'WP_UNINSTALL_PLUGIN' ) ) {
	exit();
}

global $wpdb, $wp_roles;

$status_options = get_option( 'woocommerce_status_options', array() );

// Roles + caps
include_once( 'includes/class-wc-install.php' );
WC_Install::remove_roles();

// Pages
wp_trash_post( get_option( 'woocommerce_shop_page_id' ) );
wp_trash_post( get_option( 'woocommerce_cart_page_id' ) );
wp_trash_post( get_option( 'woocommerce_checkout_page_id' ) );
wp_trash_post( get_option( 'woocommerce_myaccount_page_id' ) );
wp_trash_post( get_option( 'woocommerce_edit_address_page_id' ) );
wp_trash_post( get_option( 'woocommerce_view_order_page_id' ) );
wp_trash_post( get_option( 'woocommerce_change_password_page_id' ) );
wp_trash_post( get_option( 'woocommerce_logout_page_id' ) );

// Tables
$wpdb->query( "DROP TABLE IF EXISTS " . $wpdb->prefix . "woocommerce_attribute_taxonomies" );
$wpdb->query( "DROP TABLE IF EXISTS " . $wpdb->prefix . "woocommerce_downloadable_product_permissions" );
$wpdb->query( "DROP TABLE IF EXISTS " . $wpdb->prefix . "woocommerce_termmeta" );
$wpdb->query( "DROP TABLE IF EXISTS " . $wpdb->prefix . "woocommerce_tax_rates" );
$wpdb->query( "DROP TABLE IF EXISTS " . $wpdb->prefix . "woocommerce_tax_rate_locations" );

// Delete options
$wpdb->query("DELETE FROM $wpdb->options WHERE option_name LIKE 'woocommerce_%';");

if ( ! empty( $status_options['uninstall_data'] ) ) {
	// Delete posts + data
	$wpdb->query( "DELETE FROM {$wpdb->posts} WHERE post_type IN ( 'product', 'product_variation', 'shop_coupon', 'shop_order', 'shop_order_refund' );" );
	$wpdb->query( "DELETE FROM {$wpdb->postmeta} meta LEFT JOIN {$wpdb->posts} posts ON posts.ID = meta.post_id WHERE wp.ID IS NULL;" );
	$wpdb->query( "DROP TABLE IF EXISTS " . $wpdb->prefix . "woocommerce_order_items" );
	$wpdb->query( "DROP TABLE IF EXISTS " . $wpdb->prefix . "woocommerce_order_itemmeta" );
}