as attached picture, I have inserted data in the default value in the datashape. Now I want to retrieve data from datatable using services. how to do that?
Do you want to get the default value from the datashape specifically? As far as I understand it from the data table itself you can only get data entries that have been added.
Perhaps try writing a custom script to get the default values from the Field Definitions with the getDefaultValue() method for the specific field definitions you want to get the data from.
This link gives more information on getting the filed definition:https://support.ptc.com/cs/help/thingworx_hc/thingworx_6.6_hc/index.jspx?id=ID1239011955&action=show