use this for POSTGRESQL:

-- Start

CREATE OR REPLACE FUNCTION stock.udf_NORMDIST(

value1 FLOAT,

mean float,

sigma float,

cummulative float )

RETURNS NUMERIC( 29,9 )

AS $total$

declare total integer;

DECLARE x FLOAT;

DECLARE z FLOAT;

DECLARE t FLOAT;

DECLARE ans FLOAT;

DECLARE returnvalue FLOAT;

BEGIN

select...