Xbasic

INVERT Function

Syntax

A INVERT(A value)

Arguments

value: The name of a field in a table. Any type

Description

Used in index expressions to create an order from highest to lowest.

Discussion

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)

EMPLOYEE
NAME: DEPARTMENT AND SALARY
Deb: Marketing: 30000
Jim: Marketing: 27000
Robert: Marketing: 15000
Peter: Marketing: 10000
David: R&D: 34000
Paul: R&D: 18000
Elizabeth: R&D: 13500
Katie: R&D: 12000