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</head> <body> <h3>Mysql数据库</h3> <p>命令:<br /> show databases; 打印全部数据库<br /> use database;切换到数据库<br /> show tables; 打印数据库中的表 desc 表名;打印表的信息,表结构<br /> select * from 表名\G; 打印表中所有数据 show columns from 表名 与desc同样<br /> create database 数据库名 建立新的数据库<br /> drop database 数据库名 删除数据库<br /> create database 数据库名 charset "utf8" 建立数据库支持中文 </p> <h5>Mysql建立数据库语法</h5> <p>CREATE TABLE table<em>name (column</em>name column<em>type);<br /> create table student( stu<em>id INT NOT NULL AUTO</em>INCREMENT, name CHAR(32) NOT NULL, age INT NOT NULL, register</em>date DATE, PRIMARY KEY ( stu_id ) );</p> <h5>mysql插入数据语法</h5> <p>INSERT INTO table<em>name ( field1, field2,...fieldN )VALUES( value1, value2,...valueN );<br /> insert into student (name,age,register</em>date) values ("alex li",22,"2016-03-4")</p> <h5>mysql改</h5> <p>UPDATE table_name SET field1=new-value1, field2=new-value2 </p> <h5>mysql删除语法</h5> <p>DELETE FROM table<em>name [WHERE Clause]<br><br>delete from student where stu</em>id=5; </p> <h5>排序</h5> <p>order by</p> <h5>分组</h5> <p>group by<br /> SELECT column<em>name, function(column</em>name) FROM table_name WHERE column<em>name operator value GROUP BY column</em>name; </p> <h5>Mysql alter命令</h5> <p>咱们须要修改数据表名或者修改数据表字段时，就须要使用到MySQL ALTER命令。<br /> 添加列 alter table student add sex enum("M","F"); </p>
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