Which of the following is the primary key from one table that appears as first tale has relationship to second table is called?
a) primary key
b) candidate key
c) foreign key
d) composite key
Which of the following key has two or more columns are used to uniquely identify the table?
a) primary key
b) candidate key
c) foreign key
d) composite key
A set of one or more attributes that are taken collectively and can identify all other attributes is called
a) super key
b) secondary key
c) alternate key
d) none of these
An attribute or
combination of attributes that is not a primary key and can have duplicate data
is called
a) super key
b) secondary key
c) alternate key
d) none of these
A candidate key which is not selected as primary key is called…..
a) super key
b) secondary key
c) alternate key
d) none of these
Cardinality and Modality
