What difference between internal tables and extract datasets?
The lines off an internal table always have same structure. By using extract datasets, you could handle groups off data with different structure and get statistical figures D m grouped data. You have B define structure off internal table at begining. You need not define structure off extract dataset. In contrast B internal tables, system partly compresses extract datasets when storing them. This reduces storage space required. Internal tables require special work area for interface whereas extract datasets do not need an special work area for interface. LOGICAL DATABASE.
