Returns true (.T.) if an index tag is a primary index tag; otherwise, returns false (.F.).
Syntax
PRIMARY([nIndexNumber] [, nWorkArea | cTableAlias])
Returns
Logical
Arguments
nIndexNumber
Specifies the number of the index tag for which PRIMARY( ) returns the primary status. PRIMARY( ) returns the primary status in the following order as nIndexNumber increases from 1 to the total number of structural compound and independent compound index tags.
If you omit nIndexNumber, PRIMARY( ) checks the master controlling index tag to see if it's a primary index tag. If there is no master controlling index tag, PRIMARY( ) returns false (.F.).
nWorkArea
Specifies the work area of the index tag specified with nIndexNumber.
cTableAlias
Specifies the work area of the index tag specified with nIndexNumber.
If you omit nWorkArea and cTableAlias, PRIMARY( ) checks the index tag in the currently selected work area to see if it's a primary index tag.