首先说明的是两个版本的数据库安装次序没有先后之分，主要后一安装版本一定要另外创建实例，就可以并存。
这里假设已安装了Sql2000，下面开始安装Sql2005运行光盘
选择“服务器组件、工具、联机丛书和示例”。
接着是许可协议
然后是进行安装前的支持组件安装、扫描计算机配置
在安装向导里，sqlserver 2005安装程序会对系统进行配置检查
接下来输入注册信息；选择要安装的组件，在这个过程中可以点击"高级"来选择安装路径
接着到服认证模式选用混合认证模式，同时设置sa密码；剩下部分的安装都选默认值，一路“下一步”，最后安装，完成！
至此两个版本的数据库实现并存。
两个版本数据库共用中的一些问题
* SQL2000客户端工具无法连接SQL2005,SQL2005客户端工具可以同时连接SQL2000和SQL2005.
* SQL2000服务器始终是1433端口，SQL2005使用的是动态端口。通过SQL2005提供了一个SQL BROWER服务，开启这个服务后，就可以通过查询SQL BROWER服务知道SQL2005现在正在使用哪个端口。当然也可以把SQL2005的动态端口改成静态的，修改过程如下:运行SQL配置管理程序，找到SQL的实例名称下面的协议,双击右边的TCP/IP协议，在第二选项卡中IPALL里面输入SQL运行的端口就可以了(注意不能同时填写动态端口和静态端口，否则SQL下次将无法启动)，修改完成后重新启动SQL服务即可生效。
* 修改端口后如果仍然不能连接，需要开启SQL2005的远程登陆服务。在Microsoft SQL Server 2005中默认的是不允许远程登录的，会出现【provider: SQL 网络接口, error: 26 - 定位指定的服务器/实例时出错】的错误，通过如下方法可以打开：
配置工具->sql server外围应用配置器->服务和连接的外围应用配置器->打开MSSQLSERVER节点下的Database Engine 节点,先择"远程连接",接下建议选择"同时使用TCP/IP和named pipes",确定后,重启数据库服务就可以。
* 假设同时装了sql2000（端口1443）和sql2005（端口1433），应用程序连接字符串用server=127.0.0.1可以访问sql2005，用server=机器名/实例名可以访问sql2000
问题在于：用server=127.0.0.1:1443访问sql2000不成功
如果远程访问数据库家端口，写法如下：
逗号分隔 server=127.0.0.1,1443
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