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In the architecture of a database system which external level used? In the architecture of a database system view external level used.
Question 1 Explain the concept of Foreign Key. How a foreign key differs from a Primary Key? Can the Foreign Key accept nulls? Question 2 With a necessary example explain (i)
What are the properties in a relation ? In a relation Ordering of rows is immaterial and No two rows are identical.
Construct an ER diagram for a hospital along with a set of patients and a set of medical doctors Associate with every patient a log of the several tests and examinations conducted.
Advantages of Database management system Let us summarize the advantages. Reduction of Redundancy: This is perhaps the most important advantage of using DBMS. Redundancy i
What is D command work in the respect of QBE? D: It is the command inside QBE to delete tuple(s) from the relation.
Increases efficiency : Data is stored close to most often used site, therefore retrieval would be faster. Also, data that is not required by local applications is not stored, there
Explain Strict Two-Phase locking A transaction T does not release any type of its exclusive (X) locks until that transaction commits or aborts. In this method no other transact
Why is need for the multiple access paths?
anyone have a textbook solutions case fair, 8 edition of vol 1 ?, please give me
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