Datespan_duration Datespanset_date_n Datespanset_dates Datespanset_duration Datespanset_end_date Datespanset_num_dates Datespanset_start_date Numspan_width Numspanset_width Set_end_value Set_hash Set_hash_extended Set_mem_size Set_num_values Set_start_value Set_value_n Set_values Span_hash Span_hash_extended Span_lower Span_lower_inc Span_upper Span_upper_inc Spanset_end_span Spanset_hash Spanset_hash_extended Spanset_lower Spanset_lower_inc Spanset_mem_size Spanset_num_spans Spanset_span_n Spanset_start_span Spanset_upper Spanset_upper_inc Tstzspan_duration Tstzspanset_duration Tstzspanset_end_timestamptz Tstzspanset_num_timestamps Tstzspanset_start_timestamptz Tstzspanset_timestamps Tstzspanset_timestamptz_n

Span_lower() Datum Span_lower ( PG_FUNCTION_ARGS  ) Return the lower bound of a span @sqlfn lower()