wp_postmeta meta_keys
I recently needed to know the default key names WordPress uses in the wp_postmeta table. This information is found in the ‘meta_keys’ field of the wp_postmeta table.
I put this list together for my reference and in case anyone else is also in search of the native wp_postmeta meta_keys. For a detailed description of the wp_postmeta table, fields, and entity relationship diagram (ERD), go here.
The keys used by WordPress as of 3.0.1 were:
_edit_last
_edit_lock
_menu_item_classes
_menu_item_menu_item_parent
_menu_item_object
_menu_item_object_id
_menu_item_orphaned
_menu_item_target
_menu_item_type
_menu_item_url
_menu_item_xfn
_wp_attached_file
_wp_attachment_backup_sizes
_wp_attachment_image_alt
_wp_attachment_metadata
_wp_page_template
