Here is one solution...

I do have one extra join to over state my thought process

--Join pass for attributes and amount

select sum(CD.amount)as amount from check_data CD,

--Choose employees and dates for query

(select SUB1.emplid,SUB1.payend_dt from

--Temp pay

(select a.emplid,a.payend_dt from check_data a, ps_job b where a.emplid=b.emplid and b.reg_temp='T' and b.effdt<=a.payend_dt)SUB1

LEFT OUTER JOIN

--Regular pay

(select a.emplid,a.payend_dt from check_data a, ps_job b where a.emplid=b.emplid and b.reg_temp='R' and b.effdt<=a.payend_dt)SUB2

--Join properties excluding pay dates for full-time

ON SUB1.emplid=SUB2.emplid and SUB1.payend_dt=SUB2.payend_dt

WHERE SUB2.emplid is null and SUB2.payend_dt IS null)SUB3

where SUB3.emplid=CD.emplid and SUB3.payend_dt=CD.payend_dt