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MySQL数据库初学者必读

Jun 07, 2016 pm 04:13 PM
mysql use beginner database

MySQL数据库使用必读:我们今天是要和大家一起讨论的是MySQL数据库使用必读,我前几天在相关网站看见的资料,觉得挺好,就拿出来供大家分享,希望会给你带来一些帮助在此方面。 如果MySQL(和PHP搭配之最佳组合)运行在服务器上,而你在客户端需要连接的化,需要

MySQL数据库使用必读:我们今天是要和大家一起讨论的是MySQL数据库使用必读,我前几天在相关网站看见的资料,觉得挺好,就拿出来供大家分享,希望会给你带来一些帮助在此方面。

如果MySQL(和PHP搭配之最佳组合)运行在服务器上,而你在客户端需要连接的化,需要按如下方式进行连接:

shell>MySQL(和PHP搭配之最佳组合) -h host -u user -p

Enter password:************

host和user分别代表MySQL数据库(和PHP搭配之最佳组合)服务器运行的主机名和MySQL(和PHP搭配之最佳组合)帐户名.添写时写上对应的机器的名称和MySQL(和PHP搭配之最佳组合)用户名. *********代表你的密码.

如果有效,你会看到如下提示:

Welcome to the MySQL(和PHP搭配之最佳组合) monitor. Commands end with ; or \g.

Your MySQL(和PHP搭配之最佳组合) connection id is 7 to server version: 5.0.18-nt

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

MySQL(和PHP搭配之最佳组合)>

MySQL(和PHP搭配之最佳组合)>提示符告诉你该输入命令了.

有些时候MySQL(和PHP搭配之最佳组合)会允许你匿名登陆到服务器上,此时直接输入MySQL(和PHP搭配之最佳组合)即可.

shell> MySQL(和PHP搭配之最佳组合)

成功连接后,可在MySQL数据库(和PHP搭配之最佳组合)>提示下输入quit随时退出:

MySQL(和PHP搭配之最佳组合)> quit

Bye

下面显示一个简单的查询实例,这是一个简单命令,要求得到服务器的版本号和当前日期:

MySQL(和PHP搭配之最佳组合)> select version(), current_date;

<ol class="dp-xml">
<li class="alt"><span><span>+-----------+--------------+   </span></span></li>
<li><span>version()   current_date     </span></li>
<li class="alt"><span>+-----------+--------------+   </span></li>
<li><span>5.0.18-nt   2006-07-29     </span></li>
<li class="alt"><span>+-----------+--------------+   </span></li>
<li><span>1 row in set (0.00 sec)   </span></li>
</ol>
Copy after login

MySQL(和PHP搭配之最佳组合)>

在这里我们要明白:

一个命令通常由SQL语句组成,随后跟着一个分号.

MySQL(和PHP搭配之最佳组合)的显示结果用表格(行和列)方式输出.第一行为列的标签,随后行为查询的结果.通常列标签是你查询的数据库表的列名,但若检索的是一表达式而非列值(如上一个例子),通常用表达式本身来标记列.

随后它会显示返回了多少行以及查询时间,它提供了服务器性能的一个大致估计.它表示的是时钟时间并非CPU或机器时间.

能够以大小写输入关键字,即在MySQL数据库(和PHP搭配之最佳组合)中大小写是等价的,但在一个查询语句中,要求大小写统一.

以下是另一个查询:

<ol class="dp-xml">
<li class="alt"><span><span>MySQL(和PHP搭配之最佳组合)</span><span class="tag">></span><span> SELECT SIN(PI()/4), (4+1)*5;   </span></span></li>
<li><span>+------------------+---------+   </span></li>
<li class="alt"><span>SIN(PI()/4)   (4+1)*5     </span></li>
<li><span>+------------------+---------+   </span></li>
<li class="alt"><span>0.70710678118655   25     </span></li>
<li><span>+------------------+---------+   </span></li>
<li class="alt"><span>1 row in set (0.02 sec)   </span></li>
</ol>
Copy after login

MySQL(和PHP搭配之最佳组合)>

可以在一行上输入多条语句,如:

<ol class="dp-xml">
<li class="alt"><span><span>MySQL(和PHP搭配之最佳组合)</span><span class="tag">></span><span> SELECT VERSION(); SELECT NOW();   </span></span></li>
<li><span>+-----------------+   </span></li>
<li class="alt"><span>VERSION()     </span></li>
<li><span>+-----------------+   </span></li>
<li class="alt"><span>5.1.2-alpha-log     </span></li>
<li><span>+-----------------+   </span></li>
<li class="alt"><span>1 row in set (0.00 sec)   </span></li>
<li><span>+---------------------+   </span></li>
<li class="alt"><span>NOW()     </span></li>
<li><span>+---------------------+   </span></li>
<li class="alt"><span> 2005-10-11 15:15:00     </span></li>
<li><span>+---------------------+   </span></li>
<li class="alt"><span>1 row in set (0.00 sec)   </span></li>
</ol>
Copy after login

MySQL数据库(和PHP搭配之最佳组合)>


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