A category of data or information that describes an entity is called a……
a) Attribute
b) Data item
c) record
Which of the following is NOT a general characteristic of relation?
a) Each row is unique
b) The order of columns is unique
c) row is insignificant
d) the columns are all elemental or atomic
An index can be used to……..
a) Improve database
b) Reduce data dependency
c) Document the structure of database itself
d) All of these
Which of the following are the properties of relations?
a) attribute has unique name
b) No two rows in a relation are identical
c) No multivalued attributes
d) All of these
A key is ………..
a) field that identifies record
b) the most important field in record
c) the first field of table
d) None of these
Which of the following describes the primary key?
a) It must be unique
b) It helps in indexing of a large database
b) It makes sorting quicker
d) All of these
