users and usermeta table

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Is it mandatory for each user to have entries in usermeta table as well or it’s optional? Recently, I came across a wordpress database which has thousands of users in user table however only a few of them have entries in usermeta table.

I am wondering in what scenario this could have happened as it doesn’t look like those entries were manually removed from database.

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  1. install a fresh wordpress setup on your local machine and then have a look at wp_usersmeta table . It contains meta(additional) information for each user.You (admin) can also make data entry specific to any user by this function update_user_meta() in usermeta table. and retrive the same using get_user_meta() funciton.

    All fields for all users are not necessary. meta keys can be user specific also.

    defaults meta key entries for admin in wordpress 3.6 — 

    first_name
last_name 
nickname 
description 
rich_editing 
comment_shortcuts
admin_color
use_ssl 
show_admin_bar_front
wp_capabilities
wp_user_level 
dismissed_wp_pointers
show_welcome_panel
wp_dashboard_quick_press_last_post_id
managenav-menuscolumnshidden 
metaboxhidden_nav-menus 
nav_menu_recently_edited
closedpostboxes_page 
metaboxhidden_page 
metaboxhidden_page  
wp_user-settings wp_user-settings-time

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