rem alter session set nls_date_format = 'dd/mm/yyyy hh:mi:ss';

SELECT SUM(PHoras * PHorPrec) FROM ParTra WHERE PObra = 'CAR' AND TRIM(PCenCos) = 'OB' 
AND PFech BETWEEN '01/01/2001' AND '31/12/2005' AND PHoras IS NOT NULL AND PHorPrec IS NOT NULL AND PCap NOT LIKE '#%';

SELECT * FROM PARTRA;

