The relation changes can be got back using                  command

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
• In the above DDL command the foreign key entries are got by using the keyword
• 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                  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.
• 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
• A relation project guidance Project Guidance(professor, project, student no. st-name, dept) A professor can give many projects to many students A project will have many students A project may be guided by many professors The 4 NF relation corresponding to this are