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mysql常用SQL语句

-------------------常用SQL语句，请备份好再用，基本无错---------------------------------
UPDATE `cdb_forums` SET `allowpostspecial` = '31'
所有板块的特殊主题开启
调整某个帖子的点击数
UPDATE cdb_threads SET views=点击数 WHERE tid=主题编号;
UPDATE `cdb_forums` SET `allowmediacode` = '1'
所有板块开启media代码

update cdb_settings set value = 120 WHERE variable = 'maxavatarpixel'
调整所有用户最大头像尺寸（像素）为120

UPDATE `cdb_threads` SET `closed` = '1' WHERE `fid` =20 ;
一次性关闭板块fid20帖子

把发帖数为0的用户都转到某个用户组
update cdb_members set groupid = * where posts = 0;

UPDATE `cdb_usergroups` SET `allowinvite` = '1', `inviteprice` = '价格';
开启全部用户组的邀请注册权限   并设置价格

replace INTO cdb_settings VALUES ('watermarktype','0');
去除水印图片类型

update cdb_members set lastpost='1186675200';
调整用户最后登录时间为 2007年8月10日

UPDATE `cdb_forums` SET `status` = '1',
`lastpost` = '' WHERE `fid` =6 LIMIT 1 ;
调整板块隐藏的sql！

完整关闭supesite的sql语句:
UPDATE `cdb_settings` SET `value` = '' WHERE `variable` = 'supe_siteurl' ;
UPDATE `cdb_settings` SET `value` = '' WHERE   `variable` = 'supe_sitename';
UPDATE `cdb_settings` SET `value` = '0' WHERE `variable`   = 'supe_status';
UPDATE `cdb_settings` SET `value` = '' WHERE `variable` = 'supe_tablepre';
UPDATE `cdb_settings` SET `value` = '0' WHERE `variable`   = 'supe_circlestatus';

将A板块的所有帖子转到B板块的C分类里
update cdb_threads set fid=B板块ID,typeid=c分类的ID where   fid=A板块ID;
update cdb_posts set fid=B板块ID   where   fid=A板块ID;
执行前备份一下数据库

去除后台管理员ip登录限制
UPDATE `cdb_settings` SET `value` = '' WHERE CONVERT( `variable` USING utf8 ) ='adminipaccess' LIMIT 1 ;

删除风格5
delete from cdb_styles where styleid=5 limit 1;

UPDATE `cdb_members` SET `pmsound` = '1'
论坛所有用户短消息提示音修改为提示音1

delete from cdb_usergroups where groupid = 0
删除groupid = 0的用户组

UPDATE `cdb_forums` SET `alloweditpost` = '1'
所有板块开启允许编辑帖子
论坛后台解除insenz绑定语句
delete from cdb_settings where variable='insenz'
论坛后台执行后就可以重新注册和绑定了

关闭游客浏览所有版块的语句
可以这样构造SQL语句
update cdb_forumfields   set   viewperm ='/t允许浏览的用户组的ID/t'   where   fid in(论坛板块ID)
如:
update cdb_forumfields   set   viewperm ='/t1/t2/t'   where   fid in(1,2)

UPDATE `cdb_forumfields` SET `rules` = '板块规则'
所有板块的板块规则设置~！

UPDATE `cdb_forums` SET `jammer` = '1'
开启所有板块的干扰码

开启所有会员组邀请注册的权限
UPDATE cdb_usergroups SET allowinvite=1, allowmailinvite=1, maxinvitenum=10, maxinviteday=15, inviteprice=10;
//allowinvite   允许使用邀请注册:
//allowmailinvite 允许发送邀请注册:
//maxinvitenum 24小时内购买邀请码最大数量:
//maxinviteday 邀请码有效期:
//inviteprice 邀请码购买价格:

修改最高日发帖数
UPDATE `cdb_settings` SET `value` = '昨日发帖数最高日发帖数' WHERE `variable` ='historyposts' LIMIT 1 ;
昨日发帖数和   最高日发帖数修改为你需要的数字即可，升级完sql后,更新缓存

'昨日发帖数最高日发帖数' 中间的空格是tab键~！

UPDATE `cdb_settings` SET `value` = '0' WHERE CONVERT( `variable` USING utf8 ) = 'gzipcompress' LIMIT 1 ;
关闭论坛的gzip设置！

批量对用户组禁言
update cdb_members set adminid='-1', groupid='4' where groupid='?';
delete from cdb_threads where authorid=0;
delete from cdb_posts where authorid=0;

批量删除游客组的发帖和主题
uid 2000~3000的会员全部积分清零
update cdb_members set credits=0,extcredits1=0,extcredits2=0,extcredits3=0,extcredits4=0,extcredits5=0,extcredits6=0,extcredits7=0,extcredits8=0 where uid > 2000 and uid < 3000;

指定范围内的审核主题通过审核
update cdb_threads set displayorder=0 where tid > 最小的 tid and tid < 最大的 tid

指定范围内的审核帖子通过审核
update cdb_posts set invisible = 0 where tid > 最小的tid and tid < 最大的 tid

批量删除未审核通过的帖子和主题
delete from cdb_threads   where displayorder=-2;
delete from cdb_posts   where invisible=-2;

批量关闭投票
UPDATE cdb_threads SET closed = 1 WHERE special=1

UPDATE `cdb_members` SET `secques` = ''
清空用户安全问答！

清空某个用户组的全部积分sql:
update cdb_members set credits = 0, extcredits1 = 0, extcredits2 = 0, extcredits3 = 0, extcredits4 = 0, extcredits5 = 0, extcredits6 = 0, extcredits7 = 0, extcredits8 = 0, where groupid = 用户组id;

update cdb_usergroups set allowtransfer=0

关闭所有用户组的积分转账

update cdb_threads set readperm=100 where dateline<1133300000
修改05年11月29日21点33份20秒前的主题阅读权限100
其中1133300000 是unix时间戳（以秒为单位）代表 05年11月29日21点33份20秒
readperm=100 代表阅读权限

把2005年1月1日以前的阅读权限设高.
update cdb_threads set readperm=100 where dateline<1104537600 and digest=0

批量替换帖子里面的评分者的用户名
update cdb_ratelog set uid = '新uid', username = '新username' where uid = '旧的 uid';

所有的附件默认阅读权限为1
update cdb_attachments set readperm=1

统计发帖量大约0的所有用户积分1的总量
SELECT count(`extcredits1`) FROM `cdb_members` where `posts`=0

批量修改uid1~6会员的 showemail 为 1
UPDATE `cdb_members` SET `showemail` ='1' WHERE `uid` in(1,2,3,4,5,6);

将主题tid大于14651的所有主题减去16761780
update cdb_threads set tid=tid-16761780 where tid>14651;
update cdb_posts set tid=tid-16761780 where tid>14651;
update cdb_attachments set tid=tid-16761780 where tid>14651;
update cdb_myposts set tid=tid-16761780 where tid>14651;
update cdb_activities set tid=tid-16761780 where tid>14651;
update cdb_activityapplies set tid=tid-16761780 where tid>14651;
update cdb_favorites set tid=tid-16761780 where tid>14651;
update cdb_mythreads set tid=tid-16761780 where tid>14651;
update cdb_paymentlog set tid=tid-16761780 where tid>14651;
update cdb_polloptions set tid=tid-16761780 where tid>14651;
update cdb_polls set tid=tid-16761780 where tid>14651;
update cdb_pushedthreads set tid=tid-16761780 where tid>14651;
update cdb_relatedthreads set tid=tid-16761780 where tid>14651;
update cdb_rewardlog set tid=tid-16761780 where tid>14651;
update cdb_rsscaches set tid=tid-16761780 where tid>14651;
update cdb_sessions set tid=tid-16761780 where tid>14651;
update cdb_subscriptions set tid=tid-16761780 where tid>14651;
update cdb_threadsmod set tid=tid-16761780 where tid>14651;
update cdb_tradelog set tid=tid-16761780 where tid>14651;
update cdb_trades set tid=tid-16761780 where tid>14651;
此操作前请注意备份！！（按照5.0数据表进行修改的   6.0的需要查看下数据库对比下）

将积分1加到积分2上   并清零积分1的sql
update cdb_members set extcredits1=extcredits1+extcredits2;
update cdb_members set extcredits1='0';

把300天未登录的ID移到某一特殊用户组
update cdb_members set adminid=-1,groupid=特殊用户组ID where   lastactivity< unix_timestamp()-300*24*3600

服务器上禁止IP访问命令
iptables -I INPUT -p TCP -s 218.0.211.0/24 --dport 80 -j DROP

查一个IP有哪个会员登录
select * from cdb_membsers where lastip="IP"

UPDATE cdb_posts p, cdb_attachments a SET p.attachment=1 WHERE p.pid=a.pid;
找回丢失附件的sql语句

更新昨日发贴数
昨日发贴数：
select count(*) from cdb_posts where dateline>昨天0时的时间戳 and     dateline<今天0时的时间戳
更新昨日发贴数：
UPDATE `cdb_settings` SET `value` = '昨日发帖数/t1428' WHERE `variable` ='historyposts' LIMIT 1 ;

把"新手上路"用户组下的所有会员转换到另一个特殊的用户组
pl:特殊用户组没有关联任何的管理组
update cdb_members set groupid=特殊用户组的id where groupid=新手上路用户组的id and adminid=0

删除一个板块的所有回复
delete from cdb_posts where fid = '需要删除回复的版块id' and first = 0;

delete from cdb_forums where fid=23 limit 1;
删除fid23的板块

圈子sgid字段缺少添加的sql
ALTER TABLE cdb_threads ADD sgid mediumint(8) unsigned NOT NULL default '0'

update cdb_threads set replies=(select count(*) from cdb_posts where tid=47708) where tid=47708
更新tid27708主题的统计

关闭所有板块的允许其它模块共享
update cdb_forums set allowshare=0

UPDATE `cdb_memberfields` SET `sightml` = ' '
所有用户的签名清空

UPDATE cdb_posts SET subject=REPLACE(subject,'#','楼');
批量替换帖子中的回复* #的显示为 *楼

删除一个主题的所有回复
delete from cdb_posts where tid = '需要删除回复的主题的tid' and first = 0;

UPDATE `cdb_settings` SET `value` = '1' WHERE CONVERT( `variable` USING utf8 ) = 'thumbstatus' LIMIT 1 ;
设置缩略图为     为图片附件添加缩略图

UPDATE `cdb_settings` SET `value` = '2' WHERE CONVERT( `variable` USING utf8 ) = 'thumbstatus' LIMIT 1 ;
设置缩略图为     将图片附件缩到指定的大小

批量验证所有未验证的会员
UPDATE `cdb_members` SET `groupid` = '10' WHERE groupid='8';

批量删除游客回帖和主题
delete from cdb_threads where authorid=0;
delete from cdb_posts where authorid=0;

删除在180天之前的全部短消息
delete from cdb_pms where dateline<1190518730

清空某个用户的已发短消息

update cdb_pms set delstatus=1 where msgfromid=发送者ID

所有用户组（包括系统用户组，普通用户组，特殊用户组）都可以参与投票的SQL语句：
update cdb_usergroups set allowvote=1 where groupid<4 or groupid>9

UPDATE `cdb_usergroups` SET `raterange` = '1/t-1/t1/t100/n2/t-1/t1/t100'
开启所有用户组的扩展积分1和2的评分值为最小-1 最大1 24小时100

图片附件设置正确但是不直接显示的调整sql：
update cdb_attachments set `isimage` =1 where SUBSTRING(`filename`,-3,3)='jpg' or SUBSTRING(`filename`,-3,3)='gif'

固定天数内一部份附件到远程附件的sql
update cdb_attachments set remote = '1' where dateline<unix_timestamp()-86400*天数

修改所有用户组评分的SQL语句

update `cdb_usergroups` set `raterange`='扩展积分ID/t评分最小值/t评分最大值/t24小时最大评分数/n扩展积分ID/t评分最小值/t评分最大值/t24小时最大评分数'

将主题tid大于4009的所有主题减去16773200
update cdb_activities set tid=tid-16773200 where tid>4009;
update cdb_activityapplies set tid=tid-16773200 where tid>4009;
update cdb_attachments set tid=tid-16773200 where tid>4009;
update cdb_campaigns set tid=tid-16773200 where tid>4009;
update cdb_debateposts set tid=tid-16773200 where tid>4009;
update cdb_debates set tid=tid-16773200 where tid>4009;
update cdb_favorites set tid=tid-16773200 where tid>4009;
update cdb_forumrecommend set tid=tid-16773200 where tid>4009;
update cdb_myposts set tid=tid-16773200 where tid>4009;
update cdb_mythreads set tid=tid-16773200 where tid>4009;
update cdb_paymentlog set tid=tid-16773200 where tid>4009;
update cdb_polloptions set tid=tid-16773200 where tid>4009;
update cdb_polls set tid=tid-16773200 where tid>4009;
update cdb_posts set tid=tid-16773200 where tid>4009;
update cdb_relatedthreads set tid=tid-16773200 where tid>4009;
update cdb_rewardlog set tid=tid-16773200 where tid>4009;
update cdb_rsscaches set tid=tid-16773200 where tid>4009;
update cdb_sessions set tid=tid-16773200 where tid>4009;
update cdb_subscriptions set tid=tid-16773200 where tid>4009;
update cdb_threads set tid=tid-16773200 where tid>4009;
update cdb_threadsmod set tid=tid-16773200 where tid>4009;
update cdb_threadtags set tid=tid-16773200 where tid>4009;
update cdb_tradelog set tid=tid-16773200 where tid>4009;
update cdb_trades set tid=tid-16773200 where tid>4009;
update cdb_typeoptionvars set tid=tid-16773200 where tid>4009;
update cdb_videos set tid=tid-16773200 where tid>4009;
update cdb_videotags set tid=tid-16773200 where tid>4009;
如果安装了supesite   有了推送主题表还加上：
update cdb_pushedthreads set tid=tid-16773200 where tid>4009;
以上sql为6.0版本

批量替换论坛标题内容
UPDATE `cdb_threads` SET `subject` = replace (`subject`,'需要替换的','替换后的')

UPDATE `cdb_attachments` SET `thumb` = '0'
取消所有附件的缩略图数据

UPDATE `cdb_threads` SET `highlight` = '0'
取消全部帖子的高亮显示

论坛里所有回复长度小于20的而且没有附件的贴子全部删除掉
delete from cdb_posts where length(message)<20 and attachment=0

查询ftp上的附件是否在数据库内
phpmyadmin中执行sql：
select * from cdb_attachments where attachment like "%文件名称%"

一次性给一个贴内的所有回帖人加积分
update cdb_members set extcredits2=extcredits2+10   where uid in(SELECT authorid FROM `cdb_posts` WHERE tid=主题ID)
extcredits2   是需要增加的积分字段，使用的时候要注意增加的哪个积分字段

truncate cdb_validating
清空用户审核数据表

UPDATE `cdb_members` SET `oltime` = '0'
所有用户的在线时间修改为0

把体积大于 819200kb的附件指定为远程附件
update cdb_attachments set remote = '1' WHERE filesize > 819200

ALTER TABLE `cdb_threads` CHANGE `tid` `tid` MEDIUMINT(8) UNSIGNED NOT NULL AUTO_INCREMENT;

补充的知识：

数据库菜鸟不可不看简单SQL语句小结
为了大家更容易理解我举出的SQL语句，本文假定已经建立了一个学生成绩管理数据库，全文均以学生成绩的管理为例来描述。
网络SQL数据库网站空间申请：iisp.com/vhost/?s=macui　
　1.在查询结果中显示列名：
　　a.用as关键字：select name as '姓名' from students order by age
　　b.直接表示：select name '姓名' from students order by age
　　2.精确查找:
　　a.用in限定范围：select * from students where native in ('湖南', '四川')
　　b.between...and：select * from students where age between 20 and 30
　　c.“=”：select * from students where name = '李山'
　　d.like:select * from students where name like '李%' (注意查询条件中有“%”，则说明是部分匹配，而且还有先后信息在里面，即查找以“李”开头的匹配项。所以若查询有“李”的所有对象，应该命令：'%李%';若是第二个字为李，则应为'_李%'或'_李'或'_李_'。)
　　e.[]匹配检查符：select * from courses where cno like '[AC]%' (表示或的关系，与"in(...)"类似，而且"[]"可以表示范围，如：select * from courses where cno like '[A-C]%')
　　3.对于时间类型变量的处理
　　a.smalldatetime：直接按照字符串处理的方式进行处理，例如：
select * from students where birth > = '1980-1-1' and birth <= '1980-12-31'
　　4.集函数
　　a.count()求和，如：select count(*) from students (求学生总人数)
　　b.avg(列)求平均，如：select avg(mark) from grades where cno=’B2’
　　c.max(列)和min(列)，求最大与最小
　　5.分组group
　　常用于统计时，如分组查总数：
select gender,count(sno)
from students
group by gender
(查看男女学生各有多少)
　　注意：从哪种角度分组就从哪列"group by"
　　对于多重分组，只需将分组规则罗列。比如查询各届各专业的男女同学人数，那么分组规则有：届别(grade)、专业(mno)和性别(gender)，所以有"group by grade, mno, gender"
select grade, mno, gender, count(*)
from students
group by grade, mno, gender
　　通常group还和having联用，比如查询1门课以上不及格的学生，则按学号(sno)分类有：
select sno,count(*) from grades
where mark<60
group by sno
having count(*)>1
　　6.UNION联合　
　合并查询结果，如：
SELECT * FROM students
WHERE name like ‘张%’
UNION [ALL]
SELECT * FROM students
WHERE name like ‘李%’
　　7.多表查询
　　a.内连接
select g.sno,s.name,c.coursename
from grades g JOIN students s ON g.sno=s.sno
JOIN courses c ON g.cno=c.cno
(注意可以引用别名)
b.外连接
b1.左连接
select courses.cno,max(coursename),count(sno)
from courses LEFT JOIN grades ON courses.cno=grades.cno
group by courses.cno
　左连接特点：显示全部左边表中的所有项目，即使其中有些项中的数据未填写完全。
　　左外连接返回那些存在于左表而右表中却没有的行，再加上内连接的行。
　　b2.右连接
　　与左连接类似
　　b3.全连接
select sno,name,major
from students FULL JOIN majors ON students.mno=majors.mno
　　两边表中的内容全部显示
　　c.自身连接
select c1.cno,c1.coursename,c1.pno,c2.coursename
from courses c1,courses c2 where c1.pno=c2.cno
　　采用别名解决问题。
　　d.交叉连接
select lastname+firstname from lastname CROSS JOIN firstanme
　　相当于做笛卡儿积
　　8.嵌套查询
　　a.用关键字IN,如查询李山的同乡：
select * from students
where native in (select native from students where name=’ 李山’)
　　b.使用关键字EXIST,比如，下面两句是等价的：
select * from students
where sno in (select sno from grades where cno=’B2’)
select * from students where exists
(select * from grades where
grades.sno=students.sno AND cno=’B2’)
　　9.关于排序order
　　a.对于排序order，有两种方法：asc升序和desc降序
　　b.对于排序order,可以按照查询条件中的某项排列，而且这项可用数字表示，如：
select sno,count(*) ,avg(mark) from grades
group by sno
having avg(mark)>85
order by 3
　　10.其他
　　a.对于有空格的识别名称，应该用"[]"括住。
　　b.对于某列中没有数据的特定查询可以用null判断，如select sno,courseno from grades where mark IS NULL
　　c.注意区分在嵌套查询中使用的any与all的区别，any相当于逻辑运算“||”而all则相当于逻辑运算“&&”
　　d.注意在做否定意义的查询是小心进入陷阱：
　　如，没有选修‘B2’课程的学生：
select students.*
from students, grades
where students.sno=grades.sno
AND grades.cno <> ’B2’
　　上面的查询方式是错误的，正确方式见下方：
select * from students
where not exists (select * from grades
where grades.sno=students.sno AND cno='B2')
　　11.关于有难度多重嵌套查询的解决思想：
　　如，选修了全部课程的学生：
select *
from students
where not exists ( select *
from courses
where NOT EXISTS
(select *
from grades
where sno=students.sno
AND cno=courses.cno))