base_oid_from_temporal base_type_byvalue base_type_continuous base_type_length base_type_without_bbox call_function1 call_function2 call_function3 call_input call_output call_recv call_send CallerFInfoFunctionCall4 datum2_eq2 datum2_ge2 datum2_gt2 datum2_le2 datum2_lt2 datum2_ne2 datum_add datum_copy datum_div datum_double datum_eq datum_eq2 datum_ge2 datum_gt datum_gt2 datum_le datum_le2 datum_lt datum_lt2 datum_mult datum_ne datum_ne2 datum_sort_cmp datum_sub datumarr_extract datumarr_remove_duplicates datumarr_sort datumarr_to_array double_pad ensure_base_type_continuous ensure_temporal_base_type ensure_tgeo_base_type ensure_tnumber_base_type ensure_tnumber_range_type hypot3d hypot4d period_sort_cmp periodarr_extract periodarr_sort periodarr_to_array pfree_array pfree_datumarr range_oid_from_base range_sort_cmp rangearr_extract rangearr_sort rangearr_to_array stboxarr_to_array stringarr_to_string talpha_base_type temporal_bbox_size temporal_oid_from_base temporal_type temporalarr_extract temporalarr_to_array text2cstring text_cmp textarr_to_array tgeo_base_type timestamp_sort_cmp timestamparr_extract timestamparr_remove_duplicates timestamparr_sort timestamparr_to_array tinstantarr_remove_duplicates tinstantarr_sort tinstantarr_sort_cmp tnumber_base_type tnumber_range_type tnumber_type tsequencearr_sort tsequencearr_sort_cmp tspatial_base_type tspatial_type type_has_precomputed_trajectory

datum_sub() Datum datum_sub ( Datum  l, Datum  r, Oid  typel, Oid  typer  ) Returns the subtraction of the two numbers.