SQL Write a query to find out how often customers only look at one product before purchasing, if they do purchase? Enter the $\%$ of sessions $($with purchases$)$ that meet this criteria.

A session is a user's trip, their entire trip, to the website, and it typically includes multiple events. Like they go to the home page, they click on a specific product, they go to their cart, maybe they make a purchase. Those are all events in one session. And customer might visit $2$ product page in one session. You can see that in the event$\_$type column.