Eliminar registros de un query

[[oscarac]]

lo resolvi de esta manera....

Código SQL [-]
select M.Periodo, M.Libro, M.Voucher, M.FechaVoucher,  
SUM(iif (M.DH = 'D', M.n_IMP, 0.00 )) AS DEBEMN,  
SUM(iif (M.DH = 'H', M.n_IMP, 0.00 )) AS HABERMN,  
ROUND(SUM(iif (M.DH = 'D', M.n_IMP, 0.00 )) -  SUM(iif (M.DH = 'H', M.n_IMP, 0.00 ))) AS DIFMN,  
SUM(iif (M.DH = 'D', M.u_IMP, 0.00 )) AS DEBEME,  
SUM(iif (M.DH = 'H', M.u_IMP, 0.00 )) AS HABERME,  
ROUND(SUM(iif (M.DH = 'D', M.u_IMP, 0.00 )) -  SUM(iif (M.DH = 'H', M.u_IMP, 0.00 ))) AS DIFME 
from tblmovimientocontable M  
Group by M.Periodo, M.Libro, M.Voucher, M.FechaVoucher  
Having (
ROUND(SUM(iif (M.DH = 'D', M.n_IMP, 0.00 )) -  SUM(iif (M.DH = 'H', M.n_IMP, 0.00 ))) <> 0 or
ROUND(SUM(iif (M.DH = 'D', M.u_IMP, 0.00 )) -  SUM(iif (M.DH = 'H', M.u_IMP, 0.00 ))) <> 0 )
order by M.Periodo, M.Libro, M.Voucher

algo larguita la instruccion para algo tan sencillo..

se agradece