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What is the cordinality of dbms?
the number of tuple in a relation is called the cordinality of a relation?
What is the Difference between relation schema and relation instance?
difference between relation sehema and relation instance in dbms
What is bcnf explain with respect to dbms?
Boyce -Codd normal form which is one of the forms of dbms noramlizations.normalization is converting the relations or tables in a standard form.bcnf is based on functional dependencies that take into account all candidate keys.a relation is in bcnf if every determinant has a candidate key..:)
Give entity relation diagram for hospital system in dbms?
d_id,d_name
What ensures the value of the foreign key matches another tables primary key?
It is the DBMS that ensures the value of the foreign key matches another table's primary key when referential integrity constraints are enabled within the DBMS
What is minimal normal form a relation must satisfy in dbms?
Third normal form.
What is candidate key in dbms?
more than one primary key to identify the record uniquely is called candidate key.
What do you mean by degree in DBMS?
It is the number of attribute of its relation schema. Its is an association among two or more entities..
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 relation and relationship in database?
Relation: In Database a relation represents a table or an entity that contain diffrenet attributes.An Entity constructs a relation(table) in DBMS . Relationship: In Data base relationship is that how the two entities are connected to each other ,i.e what kind of relationship type they hold between them.Primary/Foreign key is used to specify or hold this relationship. By Tanzeel Ur Rahman Bhatti
What is secondary indexes in dbms?
secondary index is a key which is created other than primary key, to speed up processing.
What is relation instance in DBMS?
In DBMS, a relation instance refers to a particular set of data rows within a database table at a given point in time. It represents the actual values stored in the database for that specific table. Each row in a relation instance corresponds to a record or tuple within the table, containing values for each attribute.
