Supported Data Types
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     The DBFNDX database driver supports the following data types for key
     expressions:

     .  Character

     .  Numeric

     .  Date

     This is consistent with dBASE III PLUS.

     The DBFNDX database driver does not support indexing with logical key
     expressions as does the default DBFNTX database driver.  This is
     actually a dBASE III PLUS limitation and is not supported by the DBFNDX
     driver in order to enforce compatibility with dBASE III PLUS.

     To work around this limitation, index logical values by converting them
     to character values like this:

     INDEX ON IIF(<lExp>, "T", "F") TO <logicalIndex>