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

If you percentage is always 'part divided by whole' (and you don't save part and whole values elsewhere), then checking its value against [0-100] is appropriate at db level. Additional constraints should be applied at other levels.

If your percentage means some kind of growth, then it may have any kind of values and should not be checked at db level.

It is case by case situation. Usually you should check at db level only constraints, which can never change or have natural limits (like first example).