The name of a field in a table. Any type
Used in index expressions to create an order from highest to lowest.
INVERT() returns the complement of the value in the field specified by Field_Name. INVERT() is used in index expressions to create an order from highest to lowest, rather than the usual lowest to highest. INVERT() is needed only in multi-field indexes that involve mixed-level ordering.
The following index expression orders a table in ascending order by department, and within department in descending order by salary:
DEPARTMENT + str(invert(SALARY), 10, 2)
DEPARTMENT AND SALARY