SQL: One SELECT for one or several row, same WHERE.

SQL: One SELECT for one or several row, same WHERE.: "SELECT fld_id, fld_name, fld_lastname, fld_date, .....
FROM table_1
WHERE fld_date = 200301 AND
fld_id = CASE
WHEN :aux_id > 0
THEN aux_id
ELSE fld_id
END "