pivot functions with variable number of columns

I want to have a pivot like function in which i should have variable number
of columns.i went for crosstab but it doesnot support variable number of
columns.Can any body suggest an alternative.like if i have a event at a
particular time of the day like one at 02:35,11:34, then i should have
column name 02:35,11:34.
Please do help me.
Punnoose




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