MySQL also does this. Personally I find it quite useful - I can avoid indexing costs or table scanning on things where either A: I know from an application lev

MySQL also does this. Personally I find it quite useful - I can avoid indexing costs or table scanning on things where either A: I know from an application level that any value is the same as all others for my query, or B: when any value is equally acceptable (e.g. to show an example result).