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Question:
(a) List four disadvantages of the File Processing System as compared to the Database Systems.
(b) The integrity of a database is enforced by integrity rules. One of these rules, the referential integrity rules, states that the database must not contain any unmatched foreign key values.
(i) Discuss what should happen on an attempt to delete the target of a foreign key reference?
(ii) Discuss what should happen on an attempt to update the primary key of the target of a foreign key reference?
Your discussion should describe the three possible techniques which can be used to deal with the problem, and provide one example for each technique.
(c) List and describe briefly the nine components of a typical database environment.
(d) Explain the difference between external, internal and conceptual schemas. How are these different schema layers related to the concept of logical and physical data independence?
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Define the following constraints for the table client. (i) BAL_DUE must be at least 1000. (ii) NAME is a unique key. (i)ALTER TABLE CLIENT ADD CONSTRAINT CLIENT_BAL_DUE_C1
examples of fields in a database
A Relation Schema represented by R(A1, A2, ..., An) is made up of the relation name the list of attributes and R Ai that it contains. A relation is described as a set of tuples
Databases and data warehouses both are databases and both contains number of rows and columns of tables containing data. Data warehouse is really different from databases because d
sql is relationally complete-justify
The database files accept the actual data and are typically the biggest in size. Depending on their shape, the tables for all the user operation can go in one database file-but
Explain the EXISTS and UNIQUE functions of SQL. Give an example for each? EXISTS: The EXISTS function takes one parameter that is a SQL statement. If any records exist which
Question (a) Differentiate between the following terms: (i) Distributed Database v/s Distributed Database management System (ii) Homogeneous Distributed Database v/s Hete
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