In thsi event I have a requirement to select distinct values of a column of a table and looping on the query result set. I dont know how to do this. Can anyone help me please? I am using MySql 5.2.42 CE Thanks
(1)编译MySQL 时,指定了一个默认的字符集,这个字符集是 latin1; (2)安装MySQL 时,可以在配置文件 (my.ini) 中指定一个默认的的字符集,如果没指定,这个值继承自编译时指定的; (3)启动mysqld 时,可以在命令行参数中指定一个默认的的字符集,如果没指定,这个值继承自配置文件中的配置,此时 character_set_ser...
Some of the variable settings has much more meaning being set for query rather than for connection. That is you might with to increase sort_buffer_size before doing large sort query but it is very likely other queries in a session are simple and quite OK with default settings. Now one can...
For LOAD DATA statements that include no CHARACTER SET clause, the server uses the character set indicated by the character_set_database system variable to interpret the information in the file. To override this, provide an explicit CHARACTER SET clause. For stored routines (procedures and functi...
session变量是仅在这次会话红中有效,在mysql中,一次会话可以理解为当前连接(除非reload,否则,一次会话就只有一次连接)。global环境变量则是确定了下一个新建立的session的变量值。使用show variables可以查看session值,如果要查看global的环境变量,则用show golbal variables语句。设置session环境变量用set variablename=value...
MySQL更新后无法启动,错误日志显示“unknown variable 'default-character-set=utf8'”。解决方法是将配置中的'default-character-set=utf8'修改为'character_set_server=utf8',之后MySQL服务恢复正常运行。
事务用来管理 insert update delete 语句(别的MySQL语句是管不了的) 下面我们说下满足事务的条件(ACID): A: Atomicity 或称不可分割性 一个事务(transaction) 中的所有操作,要么全部完成,要么全部不完成,不会结束在中间某个环节。事务在执行过程中发生错误,会被回滚(Rollback) 到事务开始前的状态,就像这个事务从...
mysql导入数据库,提示“#1231 – Variable ‘character_set_client’ can’t be set to the value of ‘NULL” 解决方法:打开.sql文件,再末尾找到以下注释,删除 /*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */; /*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */; /*...
Please expose skip-character-set-client-handshake as a variable Submitted:12 Aug 2013 15:19Modified:15 Aug 2013 22:48 Reporter:Peter Laursen(Basic Quality Contributor)Email Updates: Status:VerifiedImpact on me: None Category:MySQL Server: OptionsSeverity:S3 (Non-critical)...
[root@localhost bin]# "/usr/local/mysql-8.0.11/bin/mysqlbinlog" "/usr/local/mysql-8.0.11/data/binlog.000025" mysqlbinlog: [ERROR] unknown variable 'default-character-set=utf8' 1. 2. 解决方法: 加入个 –no-defaults 参数就好了。 [root@localhost bin]# "/usr/local/mysql-8.0.11/bin...