新建 MySQL 账户报错：
Column count of mysql.user is wrong. Expected 45, found 43. Created with MySQL 5 错误是由于你曾经升级过数据库，升级完后没有使用mysql_upgrade升级数据结构造成的。
解决办法：使用mysql_upgrade命令
$ mysql_upgrade -u root -p
Enter password:
Checking if update is needed.
Checking server version.
Running queries to upgrade MySQL server.
Checking system database.
mysql.columns_priv OK
mysql.db OK
mysql.engine_cost OK
mysql.event OK
mysql.func OK
mysql.general_log OK
mysql.gtid_executed OK
mysql.help_category OK
mysql.help_keyword OK
mysql.help_relation OK
mysql.help_topic OK
mysql.innodb_index_stats OK
mysql.innodb_table_stats OK
mysql.ndb_binlog_index OK
mysql.plugin OK
mysql.proc OK
mysql.procs_priv OK
mysql.proxies_priv OK
mysql.server_cost OK
mysql.servers OK
mysql.slave_master_info OK
mysql.slave_relay_log_info OK
mysql.slave_worker_info OK
mysql.slow_log OK
mysql.tables_priv OK
mysql.time_zone OK
mysql.time_zone_leap_second OK
mysql.time_zone_name OK
mysql.time_zone_transition OK
mysql.time_zone_transition_type OK
mysql.user OK
Upgrading the sys schema.
Checking databases.
pan.oc_accounts OK
pan.oc_activity OK
pan.oc_activity_mq OK
pan.oc_addressbookchanges OK
pan.oc_addressbooks OK
pan.oc_appconfig OK
pan.oc_authtoken OK
pan.oc_bruteforce_attempts OK
pan.oc_calendar_invitations OK
pan.oc_calendar_reminders OK
pan.oc_calendar_resources OK
pan.oc_calendar_resources_md OK
pan.oc_calendar_rooms OK
pan.oc_calendar_rooms_md OK
pan.oc_calendarchanges OK
pan.oc_calendarobjects OK
pan.oc_calendarobjects_props OK
pan.oc_calendars OK
pan.oc_calendarsubscriptions OK
pan.oc_cards OK
pan.oc_cards_properties OK
pan.oc_collres_accesscache OK
pan.oc_collres_collections OK
pan.oc_collres_resources OK
pan.oc_comments OK
pan.oc_comments_read_markers OK
pan.oc_credentials OK
pan.oc_dav_cal_proxy OK
pan.oc_dav_shares OK
pan.oc_directlink OK
pan.oc_external_applicable OK
pan.oc_external_config OK
pan.oc_external_mounts OK
pan.oc_external_options OK
pan.oc_federated_reshares OK
pan.oc_file_locks OK
pan.oc_filecache OK
pan.oc_filecache_extended OK
pan.oc_files_trash OK
pan.oc_flow_checks OK
pan.oc_flow_operations OK
pan.oc_group_admin OK
pan.oc_group_user OK
pan.oc_groups OK
pan.oc_jobs OK
pan.oc_login_flow_v2 OK
pan.oc_maps_address_geo OK
pan.oc_maps_apikeys OK
pan.oc_maps_device_points OK
pan.oc_maps_devices OK
pan.oc_maps_favorites OK
pan.oc_maps_photos OK
pan.oc_maps_tracks OK
pan.oc_migrations OK
pan.oc_mimetypes OK
pan.oc_mounts OK
pan.oc_notes_meta OK
pan.oc_notifications OK
pan.oc_notifications_pushtokens OK
pan.oc_oauth2_access_tokens OK
pan.oc_oauth2_clients OK
pan.oc_ocdownloader_adminsettings OK
pan.oc_ocdownloader_personalsettings OK
pan.oc_ocdownloader_queue OK
pan.oc_phonetrack_devices OK
pan.oc_phonetrack_filtersb OK
pan.oc_phonetrack_geofences OK
pan.oc_phonetrack_points OK
pan.oc_phonetrack_proxims OK
pan.oc_phonetrack_pubshares OK
pan.oc_phonetrack_sessions OK
pan.oc_phonetrack_shares OK
pan.oc_phonetrack_tileserver OK
pan.oc_preferences OK
pan.oc_privacy_admins OK
pan.oc_properties OK
pan.oc_schedulingobjects OK
pan.oc_share OK
pan.oc_share_external OK
pan.oc_storages OK
pan.oc_systemtag OK
pan.oc_systemtag_group OK
pan.oc_systemtag_object_mapping OK
pan.oc_talk_commands OK
pan.oc_talk_guests OK
pan.oc_talk_participants OK
pan.oc_talk_rooms OK
pan.oc_talk_signaling OK
pan.oc_text_documents OK
pan.oc_text_sessions OK
pan.oc_text_steps OK
pan.oc_trusted_servers OK
pan.oc_twofactor_backupcodes OK
pan.oc_twofactor_providers OK
pan.oc_users OK
pan.oc_vcategory OK
pan.oc_vcategory_to_object OK
pan.oc_whats_new OK
sys.sys_config OK
Upgrade process completed successfully.
Checking if update is needed.