每一列的和超过20列的表，不写出每一个和。

so i need to get the sum of 20+ columns in a table that i'm working with and i'd really like to not have to write out the sum of every single column but i'm not sure that is possible. is there a way to get this to be dynamically written for all the columns in the table?so i need to get the sum of 20+ columns in a ta