Chart FX data comparison


 I'm new to the chart fx world. I'm trying to show 2 Data sets on the
same graph and with  the same query, but different dates. example 1)
1/1/1997 - 12/31/97  2) 1/1/98 12/31/98. All the condition are the same.
I just want to do a comparison between the dates and display the
different data sets on the same chart.