How many columns we can add in a SharePoint list

Question

I have client, who has a SharePoint List with 360 columns(including default columns).

My questions are

1. How many column we can add in a SharePoint list?
2. If is there any limit, why didn't it throw any error at time of column addition?

The only reason client gave me for these many columns is, it helps them to get all data in export to excel.

Answer 1

There isn't a limit as in you can only have X number. There is a limit of 8000 bytes before row wrapping in SQL occurs. Each field has a different byte value associated with it. You can see them listed here.