The number of tuples in a relation is called its
A set of possible data values for an attribute is called its
The smallest unit of data in the relational model is
The relational model is concerned with which aspect of data ?
Which rule guarantees that every primary key attribute is non-null ?
The candidate keys other than the primary key are called
Which of the following keys in a relation can uniquely identify a row ?
What is the degree of a table with 300 rows and 25 columns ?
What is the cardinality of the table with 645 rows and 5 columns ?
The constraints enforced in the database by the business rules or real world limitations are called