SELECT
(SELECT COUNT(DISTINCT w.wishlist_id)
FROM wishlist w
INNER JOIN wishlist_item i ON w.wishlist_id = i.wishlist_id)
/
(SELECT COUNT(*) FROM customer_entity)
* 100 as '%'
SELECT
(SELECT COUNT(DISTINCT w.wishlist_id)
FROM wishlist w
INNER JOIN wishlist_item i ON w.wishlist_id = i.wishlist_id)
/
(SELECT COUNT(*) FROM customer_entity)
* 100 as '%'