http://magento.stackexchange.com/questions/102936/magento-2-how-to-truncate-customers-products-reviews-and-orders-table
SET FOREIGN_KEY_CHECKS = 0;
Truncate order tables
TRUNCATE TABLE `gift_message`;
TRUNCATE TABLE `quote`;
TRUNCATE TABLE `quote_address`;
TRUNCATE TABLE `quote_address_item`;
TRUNCATE TABLE `quote_id_mask`;
TRUNCATE TABLE `quote_item`;
TRUNCATE TABLE `quote_item_option`;
TRUNCATE TABLE `quote_payment`;
TRUNCATE TABLE `quote_shipping_rate`;
TRUNCATE TABLE `reporting_orders`;
TRUNCATE TABLE `sales_bestsellers_aggregated_daily`;
TRUNCATE TABLE `sales_bestsellers_aggregated_monthly`;
TRUNCATE TABLE `sales_bestsellers_aggregated_yearly`;
TRUNCATE TABLE `sales_creditmemo`;
TRUNCATE TABLE `sales_creditmemo_comment`;
TRUNCATE TABLE `sales_creditmemo_grid`;
TRUNCATE TABLE `sales_creditmemo_item`;
TRUNCATE TABLE `sales_invoice`;
TRUNCATE TABLE `sales_invoiced_aggregated`;
TRUNCATE TABLE `sales_invoiced_aggregated_order`;
TRUNCATE TABLE `sales_invoice_comment`;
TRUNCATE TABLE `sales_invoice_grid`;
TRUNCATE TABLE `sales_invoice_item`;
TRUNCATE TABLE `sales_order`;
TRUNCATE TABLE `sales_order_address`;
TRUNCATE TABLE `sales_order_aggregated_created`;
TRUNCATE TABLE `sales_order_aggregated_updated`;
TRUNCATE TABLE `sales_order_grid`;
TRUNCATE TABLE `sales_order_item`;
TRUNCATE TABLE `sales_order_payment`;
TRUNCATE TABLE `sales_order_status_history`;
TRUNCATE TABLE `sales_order_tax`;
TRUNCATE TABLE `sales_order_tax_item`;
TRUNCATE TABLE `sales_payment_transaction`;
TRUNCATE TABLE `sales_refunded_aggregated`;
TRUNCATE TABLE `sales_refunded_aggregated_order`;
TRUNCATE TABLE `sales_shipment`;
TRUNCATE TABLE `sales_shipment_comment`;
TRUNCATE TABLE `sales_shipment_grid`;
TRUNCATE TABLE `sales_shipment_item`;
TRUNCATE TABLE `sales_shipment_track`;
TRUNCATE TABLE `sales_shipping_aggregated`;
TRUNCATE TABLE `sales_shipping_aggregated_order`;
TRUNCATE TABLE `tax_order_aggregated_created`;
TRUNCATE TABLE `tax_order_aggregated_updated`;
Truncate Customer tables
TRUNCATE TABLE `customer_address_entity`;
TRUNCATE TABLE `customer_address_entity_datetime`;
TRUNCATE TABLE `customer_address_entity_decimal`;
TRUNCATE TABLE `customer_address_entity_int`;
TRUNCATE TABLE `customer_address_entity_text`;
TRUNCATE TABLE `customer_address_entity_varchar`;
TRUNCATE TABLE `customer_entity`;
TRUNCATE TABLE `customer_entity_datetime`;
TRUNCATE TABLE `customer_entity_decimal`;
TRUNCATE TABLE `customer_entity_int`;
TRUNCATE TABLE `customer_entity_text`;
TRUNCATE TABLE `customer_entity_varchar`;
TRUNCATE TABLE `customer_grid_flat`;
TRUNCATE TABLE `customer_log`;
TRUNCATE TABLE `customer_log`;
TRUNCATE TABLE `customer_visitor`;
TRUNCATE TABLE `persistent_session`;
TRUNCATE TABLE `wishlist`;
TRUNCATE TABLE `wishlist_item`;
TRUNCATE TABLE `wishlist_item_option`;
Truncate Review tables
TRUNCATE TABLE `review`;
TRUNCATE TABLE `review_detail`;
TRUNCATE TABLE `review_entity_summary`;
TRUNCATE TABLE `review_store`;
Truncate Product tables
TRUNCATE TABLE `cataloginventory_stock_item`;
TRUNCATE TABLE `cataloginventory_stock_status`;
TRUNCATE TABLE `cataloginventory_stock_status_idx`;
TRUNCATE TABLE `cataloginventory_stock_status_tmp`;
TRUNCATE TABLE `catalog_category_product`;
TRUNCATE TABLE `catalog_category_product_index`;
TRUNCATE TABLE `catalog_category_product_index_tmp`;
TRUNCATE TABLE `catalog_compare_item`;
TRUNCATE TABLE `catalog_product_bundle_option`;
TRUNCATE TABLE `catalog_product_bundle_option_value`;
TRUNCATE TABLE `catalog_product_bundle_price_index`;
TRUNCATE TABLE `catalog_product_bundle_selection`;
TRUNCATE TABLE `catalog_product_bundle_selection_price`;
TRUNCATE TABLE `catalog_product_bundle_stock_index`;
TRUNCATE TABLE `catalog_product_entity`;
TRUNCATE TABLE `catalog_product_entity_datetime`;
TRUNCATE TABLE `catalog_product_entity_decimal`;
TRUNCATE TABLE `catalog_product_entity_gallery`;
TRUNCATE TABLE `catalog_product_entity_int`;
TRUNCATE TABLE `catalog_product_entity_media_gallery`;
TRUNCATE TABLE `catalog_product_entity_media_gallery_value`;
TRUNCATE TABLE `catalog_product_entity_media_gallery_value_to_entity`;
TRUNCATE TABLE `catalog_product_entity_media_gallery_value_video`;
TRUNCATE TABLE `catalog_product_entity_text`;
TRUNCATE TABLE `catalog_product_entity_tier_price`;
TRUNCATE TABLE `catalog_product_entity_varchar`;
TRUNCATE TABLE `catalog_product_index_eav`;
TRUNCATE TABLE `catalog_product_index_eav_decimal`;
TRUNCATE TABLE `catalog_product_index_eav_decimal_idx`;
TRUNCATE TABLE `catalog_product_index_eav_decimal_tmp`;
TRUNCATE TABLE `catalog_product_index_eav_idx`;
TRUNCATE TABLE `catalog_product_index_eav_tmp`;
TRUNCATE TABLE `catalog_product_index_price`;
TRUNCATE TABLE `catalog_product_index_price_bundle_idx`;
TRUNCATE TABLE `catalog_product_index_price_bundle_opt_idx`;
TRUNCATE TABLE `catalog_product_index_price_bundle_opt_tmp`;
TRUNCATE TABLE `catalog_product_index_price_bundle_sel_idx`;
TRUNCATE TABLE `catalog_product_index_price_bundle_sel_tmp`;
TRUNCATE TABLE `catalog_product_index_price_bundle_tmp`;
TRUNCATE TABLE `catalog_product_index_price_cfg_opt_agr_idx`;
TRUNCATE TABLE `catalog_product_index_price_cfg_opt_agr_tmp`;
TRUNCATE TABLE `catalog_product_index_price_cfg_opt_idx`;
TRUNCATE TABLE `catalog_product_index_price_cfg_opt_tmp`;
TRUNCATE TABLE `catalog_product_index_price_downlod_idx`;
TRUNCATE TABLE `catalog_product_index_price_downlod_tmp`;
TRUNCATE TABLE `catalog_product_index_price_final_idx`;
TRUNCATE TABLE `catalog_product_index_price_final_tmp`;
TRUNCATE TABLE `catalog_product_index_price_idx`;
TRUNCATE TABLE `catalog_product_index_price_opt_agr_idx`;
TRUNCATE TABLE `catalog_product_index_price_opt_agr_tmp`;
TRUNCATE TABLE `catalog_product_index_price_opt_idx`;
TRUNCATE TABLE `catalog_product_index_price_opt_tmp`;
TRUNCATE TABLE `catalog_product_index_price_tmp`;
TRUNCATE TABLE `catalog_product_index_tier_price`;
TRUNCATE TABLE `catalog_product_index_website`;
TRUNCATE TABLE `catalog_product_link`;
TRUNCATE TABLE `catalog_product_link_attribute`;
TRUNCATE TABLE `catalog_product_link_attribute_decimal`;
TRUNCATE TABLE `catalog_product_link_attribute_int`;
TRUNCATE TABLE `catalog_product_link_attribute_varchar`;
TRUNCATE TABLE `catalog_product_option`;
TRUNCATE TABLE `catalog_product_option_price`;
TRUNCATE TABLE `catalog_product_option_title`;
TRUNCATE TABLE `catalog_product_option_type_price`;
TRUNCATE TABLE `catalog_product_option_type_title`;
TRUNCATE TABLE `catalog_product_option_type_value`;
TRUNCATE TABLE `catalog_product_relation`;
TRUNCATE TABLE `catalog_product_super_attribute`;
TRUNCATE TABLE `catalog_product_super_attribute_label`;
TRUNCATE TABLE `catalog_product_super_link`;
TRUNCATE TABLE `catalog_product_website`;
TRUNCATE TABLE `catalog_url_rewrite_product_category`;
TRUNCATE TABLE `downloadable_link`;
TRUNCATE TABLE `downloadable_link_price`;
TRUNCATE TABLE `downloadable_link_purchased`;
TRUNCATE TABLE `downloadable_link_purchased_item`;
TRUNCATE TABLE `downloadable_link_title`;
TRUNCATE TABLE `downloadable_sample`;
TRUNCATE TABLE `downloadable_sample_title`;
TRUNCATE TABLE `product_alert_price`;
TRUNCATE TABLE `product_alert_stock`;
TRUNCATE TABLE `report_compared_product_index`;
TRUNCATE TABLE `report_viewed_product_aggregated_daily`;
TRUNCATE TABLE `report_viewed_product_aggregated_monthly`;
TRUNCATE TABLE `report_viewed_product_aggregated_yearly`;
TRUNCATE TABLE `report_viewed_product_index`;
SET FOREIGN_KEY_CHECKS = 1;RUNCATE CATEGORIES AND CREATING A ROOT CATEGORY
SET FOREIGN_KEY_CHECKS = 0;
TRUNCATE TABLE `catalog_category_entity`;
TRUNCATE TABLE `catalog_category_entity_datetime`;
TRUNCATE TABLE `catalog_category_entity_decimal`;
TRUNCATE TABLE `catalog_category_entity_int`;
TRUNCATE TABLE `catalog_category_entity_text`;
TRUNCATE TABLE `catalog_category_entity_varchar`;
TRUNCATE TABLE `catalog_category_product`;
TRUNCATE TABLE `catalog_category_product_index`;
INSERT INTO `catalog_category_entity` (`entity_id`, `attribute_set_id`, `parent_id`, `created_at`, `updated_at`, `path`, `position`, `level`, `children_count`) VALUES ('1', '0', '0', '2016-06-23 00:00:00', '2016-06-23 00:00:00', '1', '0', '0', '1'), ('2', '3', '1', '2016-06-23 00:00:00', '2016-06-23 00:00:00', '1/2', '1', '1', '0');
INSERT INTO `catalog_category_entity_datetime` (`value_id`, `attribute_id`, `store_id`, `entity_id`, `value`) VALUES ('1', '58', '0', '1', NULL), (2, 58, 0, 2, NULL);
INSERT INTO `catalog_category_entity_decimal` (`value_id`, `attribute_id`, `store_id`, `entity_id`, `value`) VALUES
(1, 69, 0, 2, NULL);
INSERT INTO `catalog_category_entity_int` (`value_id`, `attribute_id`, `store_id`, `entity_id`, `value`) VALUES ('1', '66', '0', '1', '1'), (2, 43, 0, 2, 1), (3, 50, 0, 2, NULL), (4, 51, 0, 2, 1), (5, 66, 0, 2, 1), (6, 68, 0, 2, 0);
INSERT INTO `catalog_category_entity_text` (`value_id`, `attribute_id`, `store_id`, `entity_id`, `value`) VALUES ('1', '64', '0', '1', NULL), (2, 64, 0, 2, NULL), (3, 44, 0, 2, NULL), (4, 47, 0, 2, NULL), (5, 48, 0, 2, NULL), (6, 61, 0, 2, NULL);
INSERT INTO `catalog_category_entity_varchar` (`value_id`, `attribute_id`, `store_id`, `entity_id`, `value`) VALUES ('1', '42', '0', '1', 'Root Catalog');
INSERT INTO `catalog_category_entity_varchar` (`value_id`, `attribute_id`, `store_id`, `entity_id`, `value`) VALUES (2, 42, 0, 2, 'Default Category'), (3, 46, 0, 2, NULL), (4, 49, 0, 2, 'PRODUCTS'), (5, 57, 0, 2, NULL), (6, 60, 0, 2, NULL), (7, 65, 0, 2, NULL), (8, 113, 0, 2, 'default-category'), (9, 114, 0, 2, NULL), (10, 143, 0, 2, NULL), (11, 145, 0, 2, NULL), (12, 147, 0, 2, NULL);
SET FOREIGN_KEY_CHECKS = 1;