原来用3.1，执行了用户优化用户表就分成了两个，有什么问题我就不说了，前两天升级了DX3.3顺便把用户表合并清理了，具体步骤如下：
版本：DX3.3
工具：phpmyadmin
说明：我也是按照论坛一位朋友的操作来的，写出来一是给需要做合并的朋友参考，另外也给自己留个记录。。。，数据库操作有风险，自己注意备份，出了问题别来骂我就好，我只是把自己的操作步骤写出来，不证明别人都一定没问题。。。。
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建两个临时表备用，复制主表格式

create table  pre_common_member_temp like  pre_common_member;

create table  pre_common_member_temp2 like  pre_common_member;

将主表数据插入临表一

insert into pre_common_member_temp  select * from pre_common_member;

备份存档表

create table  pre_common_member_archive_bak like  pre_common_member_archive;

insert into  pre_common_member_archive_bak select * from  pre_common_member_archive;

将存档表数据插入临表一

insert ignore into pre_common_member_temp  select * from pre_common_member_archive;

注：insert ignore into （忽略数据库中已经存在 的数据，如果数据库没有数据，就插入新的数据，如果有数据的话就跳过这条数据。这样就可以保留数据库中已经存在数据，达到在间隙中插入数据的目的。）

将临表一的数据去重复排序插入临表二

insert into pre_common_member_temp2  select * from pre_common_member_temp order by uid;

主表改成bak备份，临表二改成主表名，清空存档表的数据

ALTER  TABLE pre_common_member RENAME TO pre_common_member_bak;

ALTER  TABLE pre_common_member_temp2 RENAME TO pre_common_member;

TRUNCATE TABLE  `pre_common_member_archive`;

除了这个表pre_common_member，还有pre_common_member_field_home，pre_common_member_profile，pre_common_member_status,pre_common_member_count(最后这个不确定，忘记了，好像一共是5个)等几个带archive的，都这样合并为一个，并保留个空的archive表。


快捷操作提示：
可以将以上操作语句分别替换为下面需要执行SQL的表名即可：【总共6个表，上面的操作只是操作的下面列表的第一个，请继续执行余下5个表】
---------------------------------------------------
pre_common_member
pre_common_member_count
pre_common_member_field_forum
pre_common_member_field_home
pre_common_member_profile
pre_common_member_status
--------------------------------------------------
快捷SQL执行语句：

create table  pre_common_member_count_temp like  pre_common_member_count;
create table  pre_common_member_count_temp2 like  pre_common_member_count;
insert into pre_common_member_count_temp  select * from pre_common_member_count;
create table  pre_common_member_count_archive_bak like  pre_common_member_count_archive;
insert into  pre_common_member_count_archive_bak select * from  pre_common_member_count_archive;
insert into pre_common_member_count_temp  select * from pre_common_member_count_archive;
insert into pre_common_member_count_temp2  select * from pre_common_member_count_temp order by uid;
ALTER  TABLE pre_common_member_count RENAME TO pre_common_member_count_bak;
ALTER  TABLE pre_common_member_count_temp2 RENAME TO pre_common_member_count;
TRUNCATE TABLE  `pre_common_member_count_archive`;

create table  pre_common_member_field_forum_temp like  pre_common_member_field_forum;
create table  pre_common_member_field_forum_temp2 like  pre_common_member_field_forum;
insert into pre_common_member_field_forum_temp  select * from pre_common_member_field_forum;
create table  pre_common_member_field_forum_archive_bak like  pre_common_member_field_forum_archive;
insert into  pre_common_member_field_forum_archive_bak select * from  pre_common_member_field_forum_archive;
insert into pre_common_member_field_forum_temp  select * from pre_common_member_field_forum_archive;
insert into pre_common_member_field_forum_temp2  select * from pre_common_member_field_forum_temp order by uid;
ALTER  TABLE pre_common_member_field_forum RENAME TO pre_common_member_field_forum_bak;
ALTER  TABLE pre_common_member_field_forum_temp2 RENAME TO pre_common_member_field_forum;
TRUNCATE TABLE  `pre_common_member_field_forum_archive`;

create table  pre_common_member_field_home_temp like  pre_common_member_field_home;
create table  pre_common_member_field_home_temp2 like  pre_common_member_field_home;
insert into pre_common_member_field_home_temp  select * from pre_common_member_field_home;
create table  pre_common_member_field_home_archive_bak like  pre_common_member_field_home_archive;
insert into  pre_common_member_field_home_archive_bak select * from  pre_common_member_field_home_archive;
insert into pre_common_member_field_home_temp  select * from pre_common_member_field_home_archive;
insert into pre_common_member_field_home_temp2  select * from pre_common_member_field_home_temp order by uid;
ALTER  TABLE pre_common_member_field_home RENAME TO pre_common_member_field_home_bak;
ALTER  TABLE pre_common_member_field_home_temp2 RENAME TO pre_common_member_field_home;
TRUNCATE TABLE  `pre_common_member_field_home_archive`;

create table  pre_common_member_profile_temp like  pre_common_member_profile;
create table  pre_common_member_profile_temp2 like  pre_common_member_profile;
insert into pre_common_member_profile_temp  select * from pre_common_member_profile;
create table  pre_common_member_profile_archive_bak like  pre_common_member_profile_archive;
insert into  pre_common_member_profile_archive_bak select * from  pre_common_member_profile_archive;
insert into pre_common_member_profile_temp  select * from pre_common_member_profile_archive;
insert into pre_common_member_profile_temp2  select * from pre_common_member_profile_temp order by uid;
ALTER  TABLE pre_common_member_profile RENAME TO pre_common_member_profile_bak;
ALTER  TABLE pre_common_member_profile_temp2 RENAME TO pre_common_member_profile;
TRUNCATE TABLE  `pre_common_member_profile_archive`;

create table  pre_common_member_status_temp like  pre_common_member_status;
create table  pre_common_member_status_temp2 like  pre_common_member_status;
insert into pre_common_member_status_temp  select * from pre_common_member_status;
create table  pre_common_member_status_archive_bak like  pre_common_member_status_archive;
insert into  pre_common_member_status_archive_bak select * from  pre_common_member_status_archive;
insert into pre_common_member_status_temp  select * from pre_common_member_status_archive;
insert into pre_common_member_status_temp2  select * from pre_common_member_status_temp order by uid;
ALTER  TABLE pre_common_member_status RENAME TO pre_common_member_status_bak;
ALTER  TABLE pre_common_member_status_temp2 RENAME TO pre_common_member_status;
TRUNCATE TABLE  `pre_common_member_status_archive`;

--------------------------------------------------
上面做完基本就没事了，有强迫症的可以删除带有_archive的空表，备份的_bak表，_temp的表，都可以删除。

DROP TABLE `pre_common_member_archive`;
DROP TABLE `pre_common_member_count_archive`;
DROP TABLE `pre_common_member_field_forum_archive`;
DROP TABLE `pre_common_member_field_home_archive`;
DROP TABLE `pre_common_member_profile_archive`;
DROP TABLE `pre_common_member_status_archive`;

删除带有archive的空表，更新缓存的时候出现这个错误，而且注册不了（在注册的最后一步会出现不跳转的情况）

(1146) Table 'db_web411070.common_member_archive' doesn't existSELECT COUNT(*) FROM common_member_archive
解决方法：

即在站长—数据库—升级(Discuz! 数据库升级 - 请将数据库升级语句粘贴在下面:)中执行语句 ：

DELETE FROM `pre_common_setting` WHERE `skey` = 'membersplit';

若没有找到执行语句的输入窗口 则修改config/config_global.php 当中的 $_config[admincp][runquery] 设置修改为 1
(为了安全执行完该语句后 确认解决了1146错误后 再将配置改回来 ) 刷新后再输入执行。

为了数据安全执行该语句前建议备份数据！！！