does character ' and ` equal in mysql command? mysql&gt; select 'user_url' from wp_users;
mysql&gt; select `user_url` from wp_users;


It can get the same result ,does  character ' and ` equal in mysql command?
' or " for strings

` (backtic) for column/table/database names.

The first should give you user_url; the second should look up the value in the user_url column.