Please help! I only have 1/2 an hour to figure this out.

"js20217075" wrote:

start date end date
01/01/2010 01/01/2010
01/01/2010
01/01/2010
01/01/2010 01/01/2011
01/01/2010
01/01/2010
I want to count the start date column only if there is nothing in the end
date column.