How to get max price of all products in woocommerce?

Question

SQL

I use this code

global $wpdb;
    $minsql = "SELECT MIN(meta_value) FROM $wpdb->postmeta WHERE meta_key = %s AND meta_value<>0 AND meta_value IS NOT NULL";
    $maxsql = "SELECT MAX(meta_value) FROM $wpdb->postmeta WHERE meta_key = %s AND meta_value<>0 AND meta_value IS NOT NULL";
    $minPrice = $wpdb->get_var($wpdb->prepare($minsql, '_price'));
    $maxPrice = $wpdb->get_var($wpdb->prepare($maxsql, '_price'));

But it returns something wrong, for some reason not from all products