一。建立索引文件：对打开的索引文件，可用下列命令建立索引：
格式：index on 索引关键字|tag 索引名|to 索引文件名
说明：（1）.tag 索引名：指定索引名，此索引存放在与表名相同的。cdx文件中。
（2）.to 索引文件名：选择此项生成独立索引，即一个索引存放在一个索引文件中；否则生成的是结构化复合索引。
例1:建立"工资情况"表的结构化复合索引文件，其索引关键字分别为姓名和工资，而索引名分别为xm和gz.
use 工资情况
browse
index on 姓名 tag xm
index on 工资 tag gz
browse
分别执行以上命令后，生成了"工资情况。cdx"文件，其中存放了xm和gz两个索引。
例2:用"姓名"作索引关键字，建立"职工档案。dbf"的独立索引文件，文件名为a.idx.
use 职工档案
index on 姓名 to hello &&执行此命令，检查默认目录e:myvfp,会发现多了一个文件：hello.idx
use
二。打开索引：打开表时，系统会自动打开结构化复合索引，但此时显示的仍是物理顺序。要使索引起作用，必须指定主控索引。主控索引就是控制当前显示顺序的索引。也可以在打开表的同时指定主控索引。
1.打开表的同时打开索引并指定主控索引：
格式：use 表名 [index 索引文件名] [order tag 顺序号|索引名]
说明：（1）.index 索引文件名：用于打开独立索引文件。
（2）.order tag 顺序号|索引名：用于打开结构化复合索引。其中，顺序号为该索引在复合索引文件中的先后顺序，即在"表设计器"的"索引"选项卡中看到的该索引的位置。
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