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What is minimal super key?
no they did not
Can Super key be null?
why there is no answer yet
What is a super key in database?
S a subset of A, is a super key if S -> A. That is, the combination of all attributes in S, determines all attributes in A. Example: R(studentNo, firstName, lastName, course, instructor) FDs: studentNo -> firstName, lastName, course course -> instructor Is studentNo a super key? Yes, because studentNo yields the attributes firstName, lastName and course and course yield instructor. So with studentNo as super key, we are able to retrieve all the other attributes in relation R. Is course a super key? No, because we can only retrieve the instructor attribute and nothing else.
Candidate key and primary key differnece?
All Primary keys are definitely Candidate Keys. A Candidate key is one which can be used as a Primary key that is not null and unique. That is one of the candidate keys can be chosen as a primary key.A Candidate key is a Unique Key and it can be used to find out any particular Tuple (row) in a table. The following are the differences between A Candidate key and a Primary Key: 1) A Unique key can be null but not a Primary key 2) On a table we can have only 1 primary key but 'N' number of unique keys.
What does the primary key in a data base do?
We know that primary key is the one that is not null and is always unique. A primary key uniquely identifies a record in a table.
Can super key be as primary key?
I think super key is treated as the primary key because in a table their will be only one primary key.
How do you access the Software Center in Ubuntu?
Ubuntu Software Center should be installed by default in your system. Hit "Super" (Windows key), and start typing the name. It should show up as a button in the dash. If you don't see it anywhere, try opening a terminal and typing "software-center". If it still doesn't launch, try installing it with "sudo apt-get install software-center".
Can xbuntu be installed with the ubuntu?
Xubuntu and Ubuntu are two different versions of Ubuntu. (Ubuntu has GNOME.)
Difference between super key and composite key?
A Super key and composite key are similar to one another. Both of them are used to uniquely identify a row in a database table. A super key is a set of columns within a table that can be used to identify a particular row in a table. A super key can be only one column or a combination of multiple columns. If a super key contains multiple columns it becomes a composite key.
What is the super key in database management system?
the super key is the windows key (the flag) in non-windows OS
How do you use animations on Linux without the super key?
Animations have no direct relation whatsoever to the Super key.
What are the differences between super key primary key candidate key and foreign key?
Super key: A set of attributes that uniquely identifies a tuple in a table. Primary key: A specific super key chosen to uniquely identify each tuple in a table and must be unique and not null. Candidate key: Any super key that could be chosen as the primary key. Foreign key: A field in a table that is a primary key in another table, used to establish a relationship between the two tables.
What is minimal super key?
no they did not
What is the best ubuntu or backtrack?
Ubuntu is best, but then I'm biased, as my computers all run Ubuntu!
Which is better windows or ubuntu?
Ubuntu is better in the management manner. visit here for more info. techinfozone.net
What are the origins of Ubuntu?
Ubuntu was originated in South Africa in 2004, founded by Mark Shuttleworth, you can read more about ubuntu @
What are the functions for Ubuntu?
Ubuntu is a free, supported debian/linux implementation of Unix. As such, you can do nearly anything that you can do in Unix in Ubuntu.
