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Option to Remove Picture for every registered user

What's the best way to go about this? I imported my forum data from an installation of vBulletin 3, and everyones avatars are broken links (everything else transferred fine).
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update GDN_User set Photo = NULL;
This will reset the pictures of every user of your forum.
Just in case anyone else is reading this that after I deleted all the pictures using the above command, I used the Gravatar plugin to replace all the missing avatars with a default picture of a head. Looks a lot cleaner and more professional until the users get around to updating the avatars themselves.