If the attribute phone number is included in the relation all the values need not be entered into the phone number column. This type of entry is given as

Related MCQs

• Given the relation Supplier(s_id, p_order, s_name, qty) Given that there is a unique s_name for each s_id and that s_id, p_order is a composite key, find the correct statement among the following: i. this relation is a BCNF ii. this is 3 NF relation iii. this is a 2 NF relation iv. this is a 1 NF relation
• A                  on an attribute of a relation is a data structure that allows the database system to find those tuples in the relation that have a specified value for that attribute efficiently, without scanning through all the tuples of the relation.
• Which of the syntax is correct for insert statement? i) insert into <table_name> values <list of values> ii) insert into <table_name> (column list) values <list of values>
• An attribute in a relation is a foreign key if the                key from one relation is used as an attribute in that relation.
• The relation with the attribute which is the primary key is referenced in another relation. The relation which has the attribute as a primary key is called                              
• An attribute in a relation is a foreign key if the _______ key from one relation is used as an attribute in that relation.
• The relation with the attribute which is the primary key is referenced in another relation. The relation which has the attribute as a primary key is called ______________
• A attribute in a relation is a foreign key if the _______ key from one relation is used as an attribute in that relation .
• The relation with the attribute which is the primary key is referenced in another relation. The relation which has the attribute as primary key is called
• For each attribute of a relation, there is a set of permitted values, called the                   of that attribute.