The following example opens the customer table in the testdata database. FOR ... ENDFOR is used to create a loop in which KEY( ) is used to display the index expression of each index tag in the customer structural index. The name of each structural index tag is displayed with its index expression.
CLOSE DATABASES
OPEN DATABASE (HOME(2) + 'Data\testdata')
USE Customer && Open customer table
CLEAR
FOR nCount = 1 TO 254
IF !EMPTY(TAG(nCount)) && Checks for tags in the index
? TAG(nCount) + ' ' && Display tag name
?? KEY(nCount) && Display index expression
ELSE
EXIT && Exit the loop when no more tags are found
ENDIF
ENDFOR