I need to remove Woocommerce variations from database
<p>I have a woocommerce shop with about 3000 products. They were imported via XML file. Many of the products have variations but some of the variations had no price. </p>

<p>I would like to delete all variations that have no price but leave the rest. I'm thinking that I can do this somehow via phpMyAdmin. I would like to know how variations are stored in the database and what function I could use to remove variations of a specific value. </p>