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What is the difference between a key and a superkey in DBMS?
I am supposing that key means primary key.Superkey is any subset of attributes that uniquely identifies the tuples of a relation. This subset need not be minimal, that is, one can remove some attributes from it and it is still uniquely identifying. If all redundant attributes are removed you get a subset what is called primary key.
What is the difference between session key and master key?
A session key is a temporary encryption keyused between two principals.A master key is a long-lasting key that isused between a key distribution centre and aprincipal for the purpose of encoding thetransmission of session keys.Typically, the master keys are distributed bynoncryptographic means.
Difference between the delete key an the back space?
The backspace key deletes to the left of the cursor, and the delete key deletes to the right of the cursor.
What is the difference between WEP64 and WEP128?
WEP64 uses a 64-bit encryption key, and WEP128 uses a 128-bit key.
What difference between print screen key and print command?
print screen key takes almost a picture of what is currenly on your compuer screen
What is the difference between a key and a superkey?
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.
Is super set of the super key is the super key.?
A superkey is essentially a super set of a key. Consider a relation R(a,b,c,d) where {a} is the key. Any addition to a such as {a,b},{a,c}, {a,b,c} are considered superkeys. Furthermore, if you add more attributes to a superkey, it will be considered a superkey as well. So yes, a superset of a superkey is another superkey.
What is the differences between BCNF and 3NF in database?
3NF is where data depends on nothing but the whole key. It seems that every 3NF table should be in BCNF, as BCNF is stricter than 3NF. But, BCNF requires that every nontrivial attribute is a superkey, even if the dependent attributes are part of keys, that is, when X->Y, X is a superkey for the relation, where 3NF also allows that Y is a key attribute for the relation.
How do you link two tables that are in the same database?
You can link two tables in the same database by creating a relationship between them using a shared column (foreign key) that exists in both tables. This can be achieved through SQL queries with JOIN statements or by using database management tools to set up the relationship.
What are the difference between superkey and candidate key?
A superkey is defined as a set of attributes of a relation for which it holds that in all relations assigned to that variable there are no two distinct tuples (rows) that have the same values for the attributes in this set. As an example Code: Roll Number | First Name | Last Name CSU0001 | Shabbir | Bhimani | CSU0002 | SomeName | SurName | CSU0003 | Larry | page | Now here we have the following as super keys 1. Roll Number | First Name 2. Roll Number | First Name | Last Name Now in plain language Any Unique key with some Non Unique key combination is called a super key of the relationship. A candidate key of a relationship is a set of attributes of that relationship such that there are no two distinct tuples with the same values for these attributes. In simple example candidate key is a minimal superkey, i.e. a superkey of which no proper subset is also a superkey. Since a relation is a set(no duplicate elements), it holds that every relation will have at least one candidate key (because the entire heading is always a superkey). For practical reasons RDBMSs usually require that for each relation one of its candidate keys is declared as the primary key Quote: For example, Given an employee table consisting of the columns: employeeID name job and departmentID we could use the employeeID in combination with any or all other columns of this table to uniquely identify a row in the table. Examples of superkeys in this table would be {employeeID, Name}, {employeeID, Name, job}, and {employeeID, Name, job, departmentID}. In a real database we don't need values for all of those columns to identify a row. We only need, per our example, the set {employeeID}. This is a minimal superkey - that is, a minimal set of columns that can be used to identify a single row. So, employeeID is a candidate key. Now, if employeeID is a candidate key then why not it is the superkey. Because employeeID can also uniquely identify the tuples. (2) In your example why Roll number is not the superkey as it is uniquely identifying the tuples? (3) Quote: Any Unique key with some Non Unique key combination is called a super key of the relationship Is it necessary that Unique key has to be combined with some Non Unique key to be called as a super key. Unique key is also a super key but the minimal super key is called candidate key and all candidate keys are super keys but the reverse is not true.
Difference between a super key and a candidate key?
Different set of attributes which are able to identify any row in the database is known as super key. And minimal super key is termed as candidate key i.e. among set of super keys one with minimum number of attributes. Primary key could be any key which is able to identify a specific row in database in a unique manner.
What is the difference between a key and a superkey in DBMS?
I am supposing that key means primary key.Superkey is any subset of attributes that uniquely identifies the tuples of a relation. This subset need not be minimal, that is, one can remove some attributes from it and it is still uniquely identifying. If all redundant attributes are removed you get a subset what is called primary key.
All types of keys in database?
* Alternate key - An alternate key is any candidate key which is not selected to be the primary key * Candidate key - A candidate key is a field or combination of fields that can act as a primary key field for that table to uniquely identify each record in that table. * Compound key - compound key (also called a composite key or concatenated key) is a key that consists of 2 or more attributes. * Primary key - a primary key is a value that can be used to identify a unique row in a table. Attributes are associated with it. Examples of primary keys are Social Security numbers (associated to a specific person) or ISBNs (associated to a specific book). In the relational model of data, a primary key is a candidate key chosen as the main method of uniquely identifying a tuple in a relation. * Superkey - A superkey is defined in the relational model as a set of attributes of a relation variable (relvar) for which it holds that in all relations assigned to that variable there are no two distinct tuples (rows) that have the same values for the attributes in this set. Equivalently a superkey can also be defined as a set of attributes of a relvar upon which all attributes of the relvar are functionally dependent. * Foreign key - a foreign key (FK) is a field or group of fields in a database record that points to a key field or group of fields forming a key of another database record in some (usually different) table. Usually a foreign key in one table refers to the primary key (PK) of another table. This way references can be made to link information together and it is an essential part of database normalization
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.
Definition of super key with example?
A superkey is a combination of attributes that can be uniquely used to identify a database record. A table might have many superkeys. Candidate keys are a special subset of superkeys that do not have any extraneous information in them.
Explain about primary key super key candidate key alternate key composite key foreign key?
KEYS IN SQL* Alternate key - An alternate key is any candidate key which is not selected to be the primary key* Candidate key - A candidate key is a field or combination of fields that can act as a primary key field for that table to uniquely identify each record in that table.For Eg:The table:Emloyee(Name,Address,Ssn,Employee_Idprimary_key,Phone_ext)In the above example Ssn no. and employee identity are ccandidate keys.* Compound key - compound key (also called a composite key or concatenated key) is a key that consists of 2 or more attributes.* Primary key - a primary key is a value that can be used to identify a unique row in a table. Attributes are associated with it. Examples of primary keys are Social Security numbers (associated to a specific person) or ISBNs (associated to a specific book).In the relational model of data, a primary key is a candidate key chosen as the main method of uniquely identifying a tuple in a relation.For Eg:Emloyee(Name,Address,Ssn,Employee_Idprimary_key,Phone_ext)* Superkey - A superkey is defined in the relational model as a set of attributes of a relation variable (relvar) for which it holds that in all relations assigned to that variable there are no two distinct tuples (rows) that have the same values for the attributes in this set. Equivalently a superkey can also be defined as a set of attributes of a relvar upon which all attributes of the relvar are functionally dependent.For Eg:Emloyee(Name,Address,Ssn,Employee_Idprimary_key,Phone_ext)All the above are super keys.* Foreign key - a foreign key (FK) is a field or group of fields in a database record that points to a key field or group of fields forming a key of another database record in some (usually different) table. Usually a foreign key in one table refers to the primary key (PK) of another table. This way references can be made to link information together and it is an essential part of database normalization.For Eg:For a Student....School(Name,Address,Phone,School_Reg_noprimary_key
What is the difference between a cladogram and a dichotomous key?
The different between dichotomous key and a cladogram is they are presented in different ways.An dichotomous key is a reader that shows two statements that describes certain characteristics.Also a cladogram is used to cladistic which shows ancestral relations between organisms, to represent the evolutionary tree of life.
