Export Data from a SAP system

Your question seems to be uncertain. SAP stores data in database and SAP database structure is not conventional and quite complex.  You need to code separately on top of SAP to support export data to outside world and you are free to choose format of your choice.

Identify the user specific SQVI queries in ABAP/BAPI. With use of QucikViewer (SQVI), it is a tool for generating reports. SAP Query offers the user a whole range of options for defining reports.

Transaction Code: SQVI (Quick Viewer)

You can check out this link to know more how to generate report:

Create Report by usingsqvi