Using the Previous function to supress Detail rows

When your query in Crystal does not return Distinct records, you may want to supress rows in the Details section based upon the previous value of a field or fields. Add the following code to the Supress code area in the Section Expert for the Details section:

 if (not onfirstrecord) then
    previous({RDS_CLASS_VW.CLASS_CLASS_NBR})={RDS_CLASS_VW.CLASS_CLASS_NBR}