<!DOCTYPE html>css
<html> <head> <title>Mysql</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <style type="text/css"> /* GitHub stylesheet for MarkdownPad (http://markdownpad.com) */ /* Author: Nicolas Hery - http://nicolashery.com */ /* Version: b13fe65ca28d2e568c6ed5d7f06581183df8f2ff */ /* Source: https://github.com/nicolahery/markdownpad-github */html
/* RESET =============================================================================*/mysql
html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video { margin: 0; padding: 0; border: 0; }git
/* BODY =============================================================================*/github
body { font-family: Helvetica, arial, freesans, clean, sans-serif; font-size: 14px; line-height: 1.6; color: #333; background-color: #fff; padding: 20px; max-width: 960px; margin: 0 auto; }web
body>*:first-child { margin-top: 0 !important; }sql
body>*:last-child { margin-bottom: 0 !important; }數據庫
/* BLOCKS =============================================================================*/canvas
p, blockquote, ul, ol, dl, table, pre { margin: 15px 0; }ruby
/* HEADERS =============================================================================*/
h1, h2, h3, h4, h5, h6 { margin: 20px 0 10px; padding: 0; font-weight: bold; -webkit-font-smoothing: antialiased; }
h1 tt, h1 code, h2 tt, h2 code, h3 tt, h3 code, h4 tt, h4 code, h5 tt, h5 code, h6 tt, h6 code { font-size: inherit; }
h1 { font-size: 28px; color: #000; }
h2 { font-size: 24px; border-bottom: 1px solid #ccc; color: #000; }
h3 { font-size: 18px; }
h4 { font-size: 16px; }
h5 { font-size: 14px; }
h6 { color: #777; font-size: 14px; }
body>h2:first-child, body>h1:first-child, body>h1:first-child+h2, body>h3:first-child, body>h4:first-child, body>h5:first-child, body>h6:first-child { margin-top: 0; padding-top: 0; }
a:first-child h1, a:first-child h2, a:first-child h3, a:first-child h4, a:first-child h5, a:first-child h6 { margin-top: 0; padding-top: 0; }
h1+p, h2+p, h3+p, h4+p, h5+p, h6+p { margin-top: 10px; }
/* LINKS =============================================================================*/
a { color: #4183C4; text-decoration: none; }
a:hover { text-decoration: underline; }
/* LISTS =============================================================================*/
ul, ol { padding-left: 30px; }
ul li > :first-child, ol li > :first-child, ul li ul:first-of-type, ol li ol:first-of-type, ul li ol:first-of-type, ol li ul:first-of-type { margin-top: 0px; }
ul ul, ul ol, ol ol, ol ul { margin-bottom: 0; }
dl { padding: 0; }
dl dt { font-size: 14px; font-weight: bold; font-style: italic; padding: 0; margin: 15px 0 5px; }
dl dt:first-child { padding: 0; }
dl dt>:first-child { margin-top: 0px; }
dl dt>:last-child { margin-bottom: 0px; }
dl dd { margin: 0 0 15px; padding: 0 15px; }
dl dd>:first-child { margin-top: 0px; }
dl dd>:last-child { margin-bottom: 0px; }
/* CODE =============================================================================*/
pre, code, tt { font-size: 12px; font-family: Consolas, "Liberation Mono", Courier, monospace; }
code, tt { margin: 0 0px; padding: 0px 0px; white-space: nowrap; border: 1px solid #eaeaea; background-color: #f8f8f8; border-radius: 3px; }
pre>code { margin: 0; padding: 0; white-space: pre; border: none; background: transparent; }
pre { background-color: #f8f8f8; border: 1px solid #ccc; font-size: 13px; line-height: 19px; overflow: auto; padding: 6px 10px; border-radius: 3px; }
pre code, pre tt { background-color: transparent; border: none; }
kbd { -moz-border-bottom-colors: none; -moz-border-left-colors: none; -moz-border-right-colors: none; -moz-border-top-colors: none; background-color: #DDDDDD; background-image: linear-gradient(#F1F1F1, #DDDDDD); background-repeat: repeat-x; border-color: #DDDDDD #CCCCCC #CCCCCC #DDDDDD; border-image: none; border-radius: 2px 2px 2px 2px; border-style: solid; border-width: 1px; font-family: "Helvetica Neue",Helvetica,Arial,sans-serif; line-height: 10px; padding: 1px 4px; }
/* QUOTES =============================================================================*/
blockquote { border-left: 4px solid #DDD; padding: 0 15px; color: #777; }
blockquote>:first-child { margin-top: 0px; }
blockquote>:last-child { margin-bottom: 0px; }
/* HORIZONTAL RULES =============================================================================*/
hr { clear: both; margin: 15px 0; height: 0px; overflow: hidden; border: none; background: transparent; border-bottom: 4px solid #ddd; padding: 0; }
/* TABLES =============================================================================*/
table th { font-weight: bold; }
table th, table td { border: 1px solid #ccc; padding: 6px 13px; }
table tr { border-top: 1px solid #ccc; background-color: #fff; }
table tr:nth-child(2n) { background-color: #f8f8f8; }
/* IMAGES =============================================================================*/
img { max-width: 100% } </style>
</head> <body> <h3>Mysql數據庫</h3> <p>命令:<br /> show databases; 打印全部數據庫<br /> use database;切換到數據庫<br /> show tables; 打印數據庫中的表 desc 表名;打印表的信息,表結構<br /> select * from 表名\G; 打印表中所有數據 show columns from 表名 與desc同樣<br /> create database 數據庫名 建立新的數據庫<br /> drop database 數據庫名 刪除數據庫<br /> create database 數據庫名 charset "utf8" 建立數據庫支持中文 </p> <h5>Mysql建立數據庫語法</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插入數據語法</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刪除語法</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>分組</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>咱們須要修改數據表名或者修改數據表字段時，就須要使用到MySQL ALTER命令。<br /> 添加列 alter table student add sex enum("M","F"); </p>
</body> </html> <!-- This document was created with MarkdownPad, the Markdown editor for Windows (http://markdownpad.com) -->