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name  time1      time2      time3
a  2007-1-2  2007-1-3    null
b  2007-2-2  2007-2-3    null
b  2007-3-2  null        2007-1-3
b  2007-4-2  null        null
c  2007-5-2  2007-1-4    null
c  2007-6-2  2007-1-5    null
a  2007-7-2  2007-1-6    null

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name  count(time1) count(time2) count(time3)
a          1          1          0
b          3          1          2
c          1          1          0

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