索引还可以高效地在表之间建立连接操作

个相对简单方便的（暂时没发现明显的BUG），这里整理下分享给大家。


1、先去mysql官网下载一个odbc的驱动，因为MSsql一直没有集成mysql的驱动，这个玩意需要单独下载并安装。点我下载我使用的是MySQL的Client的工具SQLyog，安装很简单，功能界面很像SQL Server 2008，易上手。（由于本人安装的是中文破解版，为了更方便英文版的童鞋阅读理解，截图就直接那原博的来用了，嘻嘻，附上原博地址

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http://beijing.kuyiso.com/canyinfuwu/29038217x.htm索引的原理是利用特殊的查找算法（如二叉树算法），限制访问的行数，提高访问效率。
另外，索引还可以高效地在表之间建立连接操作，高效的对结果进行排序等等
2.      基本索引种类及创建
索引可以分为主键索引、普通索引、唯一索引和全文索引。
1)    主键索引
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下面通过例子来说明使用过程。

        业务系统中将订单信息存储到JSON格式的文件中，报表查询时需要读取JSON文件与数据库表（维表）进行联合查询。这里以查询某发货时间段内所有订单的客户信息为例。