Period_duration Periodset_duration Periodset_end_timestamp Periodset_num_timestamps Periodset_start_timestamp Periodset_timestamp_n Periodset_timestamps Set_end_value Set_hash Set_hash_extended Set_mem_size Set_num_values Set_start_value Set_to_span Set_value_n Set_values Span_hash Span_hash_extended Span_lower Span_lower_inc Span_upper Span_upper_inc Span_width Spanset_end_span Spanset_hash Spanset_hash_extended Spanset_lower Spanset_lower_inc Spanset_mem_size Spanset_num_spans Spanset_span_n Spanset_spans Spanset_start_span Spanset_upper Spanset_upper_inc Spanset_width

Period_duration() PGDLLEXPORT Datum Period_duration ( PG_FUNCTION_ARGS  ) Return the duration of the period. SQL Function: duration()