Should data validation be done at the database level?

Question

I am writing some stored procedures to create tables and add data. One of the fields is a column that indicates percentage. The value there should be 0-100. I started thinkin

Answer 1

You can reasonable restrict the database so that the data always makes sense. A database will support multiple applications using the same data so some restrictions make sense.

I think the only real cost in doing so would be time. I think such restrictions aren't a big deal unless you are doing something crazy. And, you can change the rules later if needed (although some changes are obviously harder than others)