Remove all WooCommerce products from database via SQL

delete-all-woocommerce-products.php

<?php

require dirname(__FILE__).'/wp-blog-header.php';

$wpdb->query("DELETE FROM wp_terms WHERE term_id IN (SELECT term_id FROM wp_term_taxonomy WHERE taxonomy LIKE 'pa_%')");
$wpdb->query("DELETE FROM wp_term_taxonomy WHERE taxonomy LIKE 'pa_%'");
$wpdb->query("DELETE FROM wp_term_relationships WHERE term_taxonomy_id not IN (SELECT term_taxonomy_id FROM wp_term_taxonomy)");
$wpdb->query("DELETE FROM wp_term_relationships WHERE object_id IN (SELECT ID FROM wp_posts WHERE post_type IN ('product','product_variation'))");
$wpdb->query("DELETE FROM wp_postmeta WHERE post_id IN (SELECT ID FROM wp_posts WHERE post_type IN ('product','product_variation'))");
$wpdb->query("DELETE FROM wp_posts WHERE post_type IN ('product','product_variation')");
$wpdb->query("DELETE pm FROM wp_postmeta pm LEFT JOIN wp_posts wp ON wp.ID = pm.post_id WHERE wp.ID IS NULL");

delete-all-woocommerce-products.sql

-- Remove all attributes from WooCommerce
DELETE FROM wp_terms WHERE term_id IN (SELECT term_id FROM wp_term_taxonomy WHERE taxonomy LIKE 'pa_%');
DELETE FROM wp_term_taxonomy WHERE taxonomy LIKE 'pa_%';
DELETE FROM wp_term_relationships WHERE term_taxonomy_id not IN (SELECT term_taxonomy_id FROM wp_term_taxonomy);
-- Delete all WooCommerce products
DELETE FROM wp_term_relationships WHERE object_id IN (SELECT ID FROM wp_posts WHERE post_type IN ('product','product_variation'));
DELETE FROM wp_postmeta WHERE post_id IN (SELECT ID FROM wp_posts WHERE post_type IN ('product','product_variation'));
DELETE FROM wp_posts WHERE post_type IN ('product','product_variation');
-- Delete orphaned postmeta
DELETE pm
FROM wp_postmeta pm
LEFT JOIN wp_posts wp ON wp.ID = pm.post_id
WHERE wp.ID IS NULL

gistfile1.txt

# Credit to @ruscon

# product removal
DELETE FROM wp_postmeta WHERE post_id IN (SELECT ID FROM wp_posts WHERE post_type = 'product');
DELETE FROM wp_posts WHERE post_type = 'product';

DELETE pm FROM wp_postmeta pm LEFT JOIN wp_posts wp ON wp.ID = pm.post_id WHERE wp.ID IS NULL;

# product related meta removal
TRUNCATE `wp_wc_product_meta_lookup`;

# product order removal
TRUNCATE `wp_wc_order_product_lookup`;

# session removal
DELETE FROM wp_woocommerce_sessions;

# reset terms count
UPDATE `wp_term_taxonomy`
SET count = 0 where taxonomy in ('product_cat', 'product_type', 'product_visibility', 'product_brand');

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

# attribute removal
DELETE FROM wp_woocommerce_attribute_taxonomies;

# terms and taxonomy removal
DELETE relations.*, taxes.*, terms.*
FROM wp_term_relationships AS relations
INNER JOIN wp_term_taxonomy AS taxes
ON relations.term_taxonomy_id=taxes.term_taxonomy_id
INNER JOIN wp_terms AS terms
ON taxes.term_id=terms.term_id
WHERE object_id IN (SELECT ID FROM wp_posts WHERE post_type='product');

DELETE meta FROM wp_termmeta meta LEFT JOIN wp_terms terms ON terms.term_id = meta.term_id WHERE terms.term_id IS NULL;

DELETE FROM `wp_term_taxonomy` WHERE `taxonomy` in ('product_cat', 'product_type', 'product_visibility', 'product_brand');

delete from `wp_termmeta`
where 
	`term_id` in ( 
		SELECT `term_id`
		FROM `wp_term_taxonomy`
		WHERE `taxonomy` in ('product_cat', 'product_type', 'product_visibility', 'product_brand') 
	);

delete from `wp_terms`  
where 
	`term_id` in ( 
		SELECT `term_id`
		FROM `wp_term_taxonomy`
		WHERE `taxonomy` in ('product_cat', 'product_type', 'product_visibility', 'product_brand') 
	);