Delete all records in the usermeta wordpress table except for specific ID's
<p>I am using Gravity Forms add on "User Registration". It adds extra meta data fields to the users. Over time and I guess changes that have been made has created more meta data than is needed. </p>

<p>There are fields like "mail-a", "mail-A", and "Mail_A". I want to start over and get rid of all this metadata but I do not want to erase 2 of the users (ID's). </p>

<p>What would I put in the Query field in phpMyAdmin to accoplish this for the Wordpress table wp_usermeta?</p>