We have the same problem (unable to edit anything), what platform are you on? we are using MS_SQL and getting this error.
WordPress database error 42000 : [Microsoft][SQL Server Native Client 11.0][SQL Server]Incorrect syntax near the keyword ‘FULL’. for query SHOW FULL COLUMNS FROM wp_posts made by edit_post, wp_update_post, wp_insert_post, pdo_wpdb->query, pdo_wpdb->_post_query, pdo_wpdb->print_error
