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Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
Define in which normalisation form if an attribute of a composite key is dependent on an attribute of other composite key. Ans: 3NF A relation is in 3 NF if an attribute of
Consider an information system designed for an online company which provides IT products and services. These include desktops, laptops, networking products, IT books, parts, and te
Define garbage collection. Garbage may be formed also as a side effect of crashes. Periodically, it is essential to find all the garbage pages and to add them to the list of fr
Which is an advantage of view? The Advantages of view is Data security, Derived columns and Hiding of complex queries
Using SQL create a view RS for the relations R and S. The view consists of the columns A and D renamed as X and Y in that order. Insert a tuple into it. Show the contents of t
List the set operations of SQL? 1) Union 2) Intersect operation 3) The except operation
With the help of a suitable diagram gives module wise explanation of system architecture of DBMS.on..
Benefits and Limitations od Data Models?
Define the Third Normal Form: The third normal form (3NF) is a normal form employed in database normalization. 3NF was initially defined by E.F. Codd in 1971. Codd's definitio
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