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Discuss the types of integrity constraints in which must be checked for the update operations - Insert and Delete. Give examples.
Insert operation can violet any of the subsequent four constraints:
1) Domain constraints could be violated if given attribute value does not appear within corresponding domain. 2) Key constraints could be violated if given attribute value does not appear within corresponding domain. 3) Entity integrity can be violated if the primary key of the latest tuple t is NULL. 4) Referential integrity can be violated if value of any foreign key in t refers to a tuple in which does not exist in referenced relation.
Delete operation can violate only referential integrity constraints, if the tuple being deleted is referenced through the foreign keys from other tuples within the database.
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What is an ERD?
Define rotational latency time. The time spent waiting for the sector to be accessed to appear under the head is known as the rotational latency time.
After going by the database architecture, let us now dwell on an important query: how is the data organised in a database? There are a lot of basic structures that exist in a datab
List the types of authorization. A) Read authorization B) Write authorization C) Update authorization D) Drop authorization
Question : (a) Database Management Systems (DBMS) is the foundation of business intelligence. Explain the following concepts related to DBMS: (i) Entity Relationship Diagr
milestone assignment
Define multivalued dependency. What do understand by trivial multivalued dependency? Ans: A multivalued dependency is a full constraint among two sets of attributes in a rela
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