p{margin:0;padding:0;} Hello, I'm a student of Korea Advanced Institute of Science and Technology in Korea. I want to compare late materialization with join and invisible join on monetdb. But when i typed SQL query, i couldn't choose which query plan to use. There was no choice to me. I think query optimizer choose some join method. Can I choose join method? or control query plan? I installed Monetdb on my desk-top and followed tutorials. Everything is done. There is no error. In this situation, i tried to control query plan. So I read reference on official homepage. But I couldn't find the information that how to control query plan. Can I control query plan? If I can, I really really want to know how do that. Where can i find some example? Please give me your favor.