The ability to view a Data Table with a different key or organization or search method using an Alternate Index can be accomplished in one of two ways:
- through a permanent definition (one that is stored on the tableBASE library)
- through a temporary definition (an alternate that has been invoked with a definition supplied at the time of invocation). A permanent Alternate Index may be Opened (OR/OW), or invoked using the IA command; a temporary Alternate Index must be Invoked using IA.
The example uses a sample table called, “EXAMPLE” that is supplied with the product. There are two types of alternate indexes, a permanent alternate index, and a temporary alternate index (see Figure 108).