Track which attributes/column are updated of a table

Hi All,
How can i track that which columns are updated of a table when update statement is executed on that particular table. I want to track it in update trigger.
Suppose table name is T1 and has columns A,b,c, ...... z.
One way is compare values of all columns using if statement like
if :new.a <> :old.a then
but this method is quite code expensive particular for table having 100 plus column.
Is there exist any dictionary view which can provide this info.

if (UPDATING('YOUR_COLUMN_NAME'))
then
  your_code_for_this_col_update ;
end if ;

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