Topic: ABAP Queries return no result

Hi, I'm a newbie to ABAP. I just installed the Netweaver Trail version 7.01 on Windows Vista Ultimate. I'm trying out some of the training materials I've laid my hands on but I'm having big issues. Non of the SQL queries return values. I've ran the same queries in SQL Studio and they work fine. I checked the return value of sy-subrc, it returns a value of 4. Does anyone have an idea what the problem might be? What do I do? I'm getting frustrated!