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以下均为查看mytable表的信息
1.查看表的存储引擎、记录数等
mysql> show table status like 'mytable' /G;*************************** 1. row *************************** Name: mytable #表名 Engine: InnoDB #存储引擎伟InnoDB Version: 10 #mysql版本 Row_format: Compact #行格式。有Dynamic,fixed,Compact等格式。Dynamic是动态行,表字段里面宝航varchar,BloB等不定长字段。fixed是定长行。Compact是行压缩。 Rows: 0 #表中的行数 Avg_row_length: 0 #平均每行的字节数 Data_length: 16384 #整个表的数据量(字节)Max_data_length: 0 #表最大的容量。0表示无限 Index_length: 0 #索引数据占用磁盘空间的大小 Data_free: 10485760 #表示已分配但还未被使用的空间大小。 Auto_increment: NULL #下一个AUto_increment的值 Create_time: 2011-08-06 22:39:46 #创建时间 Update_time: NULL #更新时间 Check_time: NULL #使用check table等命令时的检查时间 Collation: utf8_general_ci #默认字符集和字符列排列顺序 Checksum: NULL #如果启动,则表示整个表的校验和 Create_options: max_rows=4294967295 avg_row_length=32 #表创建时的选项 Comment: 1 row in set (0.00 sec)
2.查看表结构信息
mysql> desc mytable;+---------+-------------+------+-----+---------+-------+| Field | Type | Null | Key | Default | Extra |+---------+-------------+------+-----+---------+-------+| keyword | varchar(64) | NO | PRI | NULL | || queries | int(10) | YES | | NULL | |+---------+-------------+------+-----+---------+-------+
mysql> show create table mytable; CREATE TABLE `mytable` (`id` int(11) NOT NULL AUTO_INCREMENT,`title` text NOT NULL,`content` text NOT NULL,`ordering` int(11) NOT NULL DEFAULT '0',`position` varchar(50) DEFAULT NULL,`checked_out` int(11) unsigned NOT NULL DEFAULT '0',`checked_out_time` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',`published` tinyint(1) NOT NULL DEFAULT '0',`module` varchar(50) DEFAULT NULL,`numnews` int(11) NOT NULL DEFAULT '0',`access` tinyint(3) unsigned NOT NULL DEFAULT '0',`showtitle` tinyint(3) unsigned NOT NULL DEFAULT '1',`params` text NOT NULL,`iscore` tinyint(4) NOT NULL DEFAULT '0',`client_id` tinyint(4) NOT NULL DEFAULT '0',`control` text NOT NULL,PRIMARY KEY (`id`),KEY `published` (`published`,`access`),KEY `newsfeeds` (`module`,`published`)) ENGINE=MyISAM AUTO_INCREMENT=145 DEFAULT CHARSET=utf8
use information_schema;select * from columns where table_name='mytable';
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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') ”。

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。

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)..”。

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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