Let me explain here the use of Interval Match function why interval match function is used in the Qlikview application. It will used to create a table matching discrete numeric values to one or more numeric intervals.
It must placed before the load statement and syntax is
IntervalMatch (MatchField1, MatchField2) load Column1, Column2, Column3
The IntervalMatch prefix transforms the loaded table of intervals to a table that contains an additional column: the discrete numeric data points. It also expands the number of records so that the new table has one record per possible combination of discrete data point and interval.