SELECT  (PX/(AGFX+PG+ZF+QYZ+KZZ)) as MJB FROM(select case when PX is null then 0 else PX end as PX, case when AGFX is null then 0 else AGFX end as AGFX, case when PG is null then 0 else PG end as PG, case when ZF is null then 0 else ZF end as ZF, case when QYZ is null then 0 else QYZ end as QYZ, case when KZZ is null then 0 else KZZ end as KZZfrom gp_qjt_mjfh Where GPDM = '002456') A