Use operations
tee [directory file] can record mysql operations and results
set names gbk explicitly tells the mysql server that the client's encoding is gbk (to prevent garbled characters)
desc [table name] table Structural details
Login command mysql -u[username] -p[userpasswd]
Multiple tables--->Place them in one library--->Multiple libraries form a database server
Operation process
When entering the database, you first face multiple libraries, select the required library among multiple libraries, and then select the required table in the library
Specific commands
1. Check which libraries are in the database show databases;
2. Select the required library use [library name];
3. Check which tables are in the selected library show tables;
Create a library create database [unimasvg1] charset utf8;
Delete a library drop database [unimasvg1]
Modify a library (mysql library cannot change the library name)
Create a simple table
create table staff( snum int, sname varchar(10) )engine myisam charset utf8;
Rename table
rename table [oldname] to [newname]
Add content to the table
insert into [表名] values (1,'name_1'), (2,'name_2'), (3,'name_3');
Display table content
select * from [表名]
Delete a table
drop table staff
Clear table contents
truncate [表名] --- 原理是 删除表,再重建一个同样名字的表 delete from [表名] where [条件] --- (可选删除)
The speed of deleting data, generally speaking: drop> truncate > delete
The above is the content of the basic operations of mysql. For more related content, please pay attention to the PHP Chinese website (www.php.cn)!

本篇文章给大家带来了关于mysql的相关知识,其中主要介绍了关于架构原理的相关内容,MySQL Server架构自顶向下大致可以分网络连接层、服务层、存储引擎层和系统文件层,下面一起来看一下,希望对大家有帮助。

在mysql中,可以利用char()和REPLACE()函数来替换换行符;REPLACE()函数可以用新字符串替换列中的换行符,而换行符可使用“char(13)”来表示,语法为“replace(字段名,char(13),'新字符串') ”。

方法:1、利用right函数,语法为“update 表名 set 指定字段 = right(指定字段, length(指定字段)-1)...”;2、利用substring函数,语法为“select substring(指定字段,2)..”。

mysql的msi与zip版本的区别:1、zip包含的安装程序是一种主动安装,而msi包含的是被installer所用的安装文件以提交请求的方式安装;2、zip是一种数据压缩和文档存储的文件格式,msi是微软格式的安装包。

转换方法:1、利用cast函数,语法“select * from 表名 order by cast(字段名 as SIGNED)”;2、利用“select * from 表名 order by CONVERT(字段名,SIGNED)”语句。

本篇文章给大家带来了关于mysql的相关知识,其中主要介绍了关于MySQL复制技术的相关问题,包括了异步复制、半同步复制等等内容,下面一起来看一下,希望对大家有帮助。

本篇文章给大家带来了关于mysql的相关知识,其中主要介绍了mysql高级篇的一些问题,包括了索引是什么、索引底层实现等等问题,下面一起来看一下,希望对大家有帮助。

在mysql中,可以利用REGEXP运算符判断数据是否是数字类型,语法为“String REGEXP '[^0-9.]'”;该运算符是正则表达式的缩写,若数据字符中含有数字时,返回的结果是true,反之返回的结果是false。


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