Results for: superkey-1

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.

Difference between primary key super key?

A primary Key which uniquely identifies a row of table,primary key does not allow null values and also not allow duplicate values. Superkey is defined in the relational model of database organization as a set of attributes of a relation… Full Answer

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… Full Answer

How many different ways can you make 25 cents from dimes nickels and pennies?

[Legend: Each number represents the denomination (amount) of the coin.] 1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1 = 25 1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+5 = 25 1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+5+5 = 25 1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+10 = 25 1+1+1+1+1+1+1+1+1+1+5+5+5 = 25 1+1+1+1+1+5+5+10 = 25 1+1+1+1+1+5+5+5+5 = 25 1+1+1+1+1+10+10 = 25 5+5+5+5+5 = 25 5+5+5+10 = 25… Full Answer