Introduction Database Functions
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 DBFDSKSIZE() Determines the size of a selected (.dbf) file on a disk drive
 DBFSIZE()    Determines the size of a selected (.dbf) file in memory
 FIELDDECI()  Determines the number of decimal places in a field
 FIELDNUM()   Determines field number for a specific field in a database file
 FIELDSIZE()  Determines the size of a field
 FIELDTYPE()  Determines the data type for a field
 ISDBT()      Determines if a memo file (.dbt) is present