我博客上的图片原来都存放在www.zyan.cc服务器上,由于该服务器不稳定,于是我将所有图片切换到了blog.zyan.cc服务器上,同时在MySQL数据库中,将字符串www.zyan.cc批量替换为blog.zyan.cc。为了方便以后使用,我将这条“将字符串aaa批量替换为bbb”的SQL语句记录在此:
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UPDATE 表名 SET 字段名 = REPLACE (字段名, 'aaa', 'bbb');


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技术大类 » 数据库技术 | 评论(52) | 引用(0) | 阅读(53802)
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Razamehmood Email Homepage
2022-11-24 20:21
Create a reference table (required for simulation data) CREATE TABLE ' Test_nums ' (  ' id ' int (one) unsigned not NULL auto_increment,  primary KEY (' id ') Engine=innodb DEFAULT Charset=utf8 comment= ' reference table ';//analog data, insert 1-10000 continuous data.//Create a Test table ' Test_sign_history ' (& nbsp; ' id ' int (ten) unsigned NOT NULL auto_increment,   ' uid ' int (one) unsigned not null DEFAULT ' 0 ' COMMENT ' user ID ', &nbs p; ' Create_time ' timestamp not NULL DEFAULT current_timestamp COMMENT ' sign-in time ',  primary KEY (' id ')) engine=innodb DEFA ULT Charset=utf8 comment= ' Registration History table ';//create test data insert into Test_sign_history (uid,create_time) Select Ceil (rand () *10000), Str_to_date (' 2016-12-11 ', '%y-%m-%d ') +interval ceil (rand () *10000) Minutefrom test_nums where id<31;// Statistics daily user Check-in status select    h,    sum (case when Create_time= ' 2016-12-11 "then C else 0 end) 11Sign,    sum (case when Create_time= ' 2016-12-12 "then C else 0 end) 12Sign,    sum (case create_time= ' 2016-12-1 3 ' then C else 0 end] 13Sign,    sum (case Create_time= ' 2016-12-14 ' then C else 0 end) 14Sign,    sum if create_time= ' 2016-12-15 ' then C else 0 end ) 15Sign,    sum (case when Create_time= ' 2016-12-16 "then C else 0 end) 16Sign,    sum (case when Create _time= ' 2016-12-17 ' then C else 0 end) 17Signfrom (   select        date_format (Create_time, ' %y-%m-%d ') Create_time,        hour (create_time) H,        count (*) c   &NBSP ; from Test_sign_history    group by        date_format (create_time, '%y-%m-%d '),   & nbsp    hour (Create_time)) a group by H with Rollup; https://distinguished.io/companies/mobile-app-development
Dressesmax Email Homepage
2023-3-7 04:08
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jeffreestar
2024-1-16 10:04
slice master is a fast-paced arcade game where you wield a variety of blades to slice through fruit, navigate tricky obstacles, and rack up points! It's like a mix of fruit ninja and a skill-based platformer, with satisfying slicing mechanics and addictive gameplay.
Lucky cola
2024-2-7 16:04
Play, compete, and emerge victorious.  Lucky cola
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