How do you change this Oracle sql to postgresql
SELECT prd.name, pkg.name, si.name
FROM service_items si, service_link sl, products prd, packages pkg, product_package_link ppl
WHERE ppl.id='3'
AND prd.id=ppl.product_id
AND pkg.id=ppl.package_id AND sl.product_package_id(+)=ppl.id AND si.id(+)=sl.service_item_id
;