The input table is:
col1	col2	col3
nick	20/5/1950	one
john	18/2/1980	two
nick	19/6/1978	three
nick	20/5/1950	four
nick	12/9/2000	five
john	15/6/1997	six
nick	20/5/1950	seven


The output table is:
col1	col2	values
nick	20/5/1950	one|four|seven
john	18/2/1980	two
nick	19/6/1978	three
nick	12/9/2000	five
john	15/6/1997	six