But of course...
If you have a repeating table that has a date field and a value field. I'm interested in totaling the value field for a certain date.
Row 1: 10/14/2012 - Value = 7
Row 2: 10/18/2012 - Value = 6
Row 3: 10/14/2012 - Value = 3
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Total for 10/14/2012 = 10
Total for 10/18/2012 = 6