Catenate DB Result

Hello,
I have a question Plz.
How to concatenate the DB query result in Robot framework?
Actual Result : ${query} = ((b’\x00’, None, None),)
Expected Result :
${rtn_Flag} = Set Variable ${query}[…][…] =b’\x00’
${rtn_User} = Set Variable ${query}[…][…] = None
${rtn_Date} = Set Variable ${query}[…][…] = None

Each variable will contains the exact information
Thank’s for help