Hi Maruti,
Instead of looking directly into tables, you can have a look that the standard feature in PPM, "Replace user/Resource' to find out the project which the user is authorized or projects which the resource is staffed.
This WD component is available in the standard SAP delivered role 'SAP_BPR_PPM' and the path is PPM application-->Portfolio & project administration-->Replace User/resource.
If this is not appearing in the NWBC menu, then make it visible in the above PFCG role menu.
Hope this helps ans suffices your requirement.
Regards,
Ravi