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 & Regards, Surodip Patra...
(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...
设置session环境变量用set variablename=value,设置global环境变量用set global variablename=value。 环境变量可以在服务启动后用set来设置,有些(主要是和数据库服务器有关的)也可以在启动服务时用命令行参数指定,还可以在配置文件中设置(my.cnf)。 mysql提供了四个等级的默认字符集以及比较规则,分别是服务器、数据库...
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 */; /*...
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。
Assigning a returnedClusterorClusterSetobject to a variable enables you to execute further operations against the cluster or ClusterSet using the object's methods. The returned object uses a new session, independent from MySQL Shell's global session. This ensures that if you change the MySQL Shell...
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/mysqlbinlog" --no-defaults "/usr/local/mysql-8.0.11/data/binlog.000025" ...
错误信息:Variable 'sql_notes' can't be set to the value of 'NULL' 检查: 错误信息是说sql_notes不能设置为null值,登录检查如下 mysql> select @@sql_notes; +---+ | @@sql_notes | +---+ | 1 | +---+ 1 row in set (0.00
ADD COLUMN to variable table? Add prefix in data column Add Time in SQL HH:MM:SS to another HH:MM:SS Adding a column to a large (100 million rows) table with default constraint adding a extra column in a pivot table created uisng T-SQL Pivot Table query Adding a partition scheme to...