Well, it depends if your columns are blobs or not, it makes a difference (well, at least it used to).
On the other hand, I don't know which ORM you use, but they don't all behave like this, if you tell them you only want columns Name, Age, DOB, they'll only get those columns.
On the other hand, I don't know which ORM you use, but they don't all behave like this, if you tell them you only want columns Name, Age, DOB, they'll only get those columns.