Positive column in the character table of finite groups

Question

By going through the character table of small finite groups here, we can observe that there always have a single column where all the entries are positive numbers (i.e. the one giving the dimension of the irreducible complex representations).

Question: Is it true in general that there is always a single such column?

Bonus question: What if we replace positive by non-negative?

Answer 1

Yes (for both questions) because the columns are orthogonal.