How to fetch data for request fields from all the requests in mdb?

Document ID : KB000112188
Last Modified Date : 27/08/2018
Show Technical Document Details
How can we get the data for catalog request field from all the requests in mdb?
Business Service Insight 8.3.5
Please run the below query to fetch the required data

select form_elem_value from usm_request_item_form where form_elem_name = 'txt_comment'