1. 2003-04-01 Re: left join last observation sas-l Jonathan Siegel 2. 2003-03-31 Re: left join last observation sas-l David G Nasser 3. 2003-03-31 Re: left join last observation sas-l Yu Guo 4. 2003-03-31 left join last observation sas-l tin-shun-jimmy cha