In database a key is a field that we use to sort a data.whereas superkey is a subset of attribute so that no tuple have the same combination of values.
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There is no difference.
prime attributes are the attributes of a candidate key which will give uniqueness. a candidate key is (the subset of superkey) which gives uniqueness. Super key is the maximum set of attributes that can provide uniqueness example ABCDE is a super key AB CD DE are the candidate keys s.t. AB is the primary key. CD and DE are the secondary/alternate keys.
difference between as on and as at
it is a set one or more attribute,that taken collectively allow as to idendify uniquly and entity in entity set. ex-customer-id,
The enter key will further a page if the appropriate link/hyperlink is available, or drop down to the next line. The tab key will either jump from one text-box to another, or create a large space for indenting paragraphs.