Query to Get Employee Leave Details in Project

SELECT PAPF.EMPLOYEE_NUMBER,
PAPF.FULL_NAME “EMPLOYEE NAME” ,
PT.DESCRIPTION “LEAVE DESC”,
TO_DATE(trunc(ei.EXPENDITURE_ITEM_DATE),’DD-MON-YYYY’) “DATE”,
EI.QUANTITY “LEAVE HOUR”,
PEC.EXPENDITURE_COMMENT
FROM pa_projects_all p,
pa_tasks Pt,
pa_expenditure_items_all ei,
pa_expenditures_all x,
pa_project_types_all pta,
pa_transaction_sources tr,
hr_all_organization_units_tl o1,
per_jobs j,
per_all_people_f papf,
pa_expenditure_comments pec
WHERE 1 = 1
AND papf.FULL_NAME=’SINGH, PREM S’
AND pt.project_id = p.project_id
AND ei.project_id = p.project_id
AND p.project_type = pta.project_type
AND p.org_id = pta.org_id
AND ei.task_id = pt.task_id
AND ei.expenditure_id = x.expenditure_id
AND NVL (ei.override_to_organization_id, x.incurred_by_organization_id) = o1.organization_id
AND ei.job_id = j.job_id(+)
AND ei.transaction_source = tr.transaction_source(+)
AND P.PROJECT_ID = 278436
AND papf.person_id = x.incurred_by_person_id
AND ei.expenditure_item_id = pec.expenditure_item_id(+);