Add_number_tnumber Add_tnumber_number Add_tnumber_tnumber Div_number_tnumber Div_tnumber_number Div_tnumber_tnumber Float_angular_difference Float_degrees Mult_number_tnumber Mult_tnumber_number Mult_tnumber_tnumber Sub_number_tnumber Sub_tnumber_number Sub_tnumber_tnumber Temporal_derivative Tfloat_ceil Tfloat_degrees Tfloat_exp Tfloat_floor Tfloat_ln Tfloat_log10 Tfloat_radians Tnumber_abs Tnumber_delta_value

Temporal_derivative() Datum Temporal_derivative ( PG_FUNCTION_ARGS  ) Return the derivative of a temporal number @sqlfn derivative()