how can we update null value columns in a table in sql serve

Question

Hello,
 
how can we update null value columns in whole table in sql server, without using column name?
 
I want to update all null value columns in a table, many columns in my table, So, can we update all null value columns without using column name?
 
Please help me.
 
Thanks in advance.
 
Ankit Agarwal
Software Engineer