Running totals and sums using PostgreSQL 8.4 Windowing functions

(Leo Hsu and Regina Obe) One thing that is pretty neat about windowing functions in PostgreSQL 8.4 aside from built-in windowing functions (row_number(), rank(), lead(), lag(), dense_rank(), percent_rank(), cume_dist(), first_value, last_value, nth_value) as documented in the manual Windowing Functi

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