>>>Walter,
>>
>>This is a bad rule.
>
>Why do you say that?

Adding 3 letter prefixes to every column in a table looks meaningless to me and more to type. The column name should describe what this column represents, not have some extra garbage in front. Also, it's easy to use the same column name in the referenced and referencing tables, this way we can tell right away about relations between tables.

Say, you would name column OrderId in Orders and OrderDetails tables. Wondering how would Walter name them.