If so, you need SAP Universal ID. In a few months, SAP Universal ID will be the only option to login to SAP Community. Without it, you will lose your content and badges. If you have multiple accounts, use the Consolidation Tool to merge your content.
I have to declare the dynamic internal table. My requirement is there is one internal table and contains so many columns. If it column value is 'X', then i have to declare the internal table with those columns. How it is possible.