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What is the difference between a key and a legend?
There is no difference.
What is the prime attribute in DBMS?
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.
What is difference between as on and as at?
difference between as on and as at
What is superkey?
it is a set one or more attribute,that taken collectively allow as to idendify uniquly and entity in entity set. ex-customer-id,
What is the difference between using the tab key and the enter key?
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.
