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10A.53 Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department. 10A.54 Code an Oracle Database trigger to allow the delet
Update or Modify operation alters the existing values. If these operations alter the value that is the foreign key also, the only check need is the similar as that of the Insert op
Explain the benefit of OOM. Main benefits of object oriented modeling are development of system become fast, quality of the system get improve. It gives freedom of use of alrea
1. Which model is used to store data in tree structures Ans: Hierarchical model is used to store data in tree structures
Types of data independence Data independence can be classified into the following two types: Physical Data Independence: This means that for any change made in the physi
Do NOT use the timestamp type. Use separate date and time data types only. Figure out how to define an SQL insert statement that uses built-in SQL (or MySQL) functions to define
What are the various forms of data transparency? a) fragmentation transparency b) replication transparency c) location transparency
Define object-relational systems? Systems that give object-oriented extensions to relational systems are known as object-relational systems.
A buyer for a large department store chain must place orders with an athletic shoe manufacturer six months prior to the time the shoes will be sold in the department stores. In par
Describe the nested-loop join and block-nested loop join. Ans: The block nested- loop join algorithm is as described below: for every block B r of relation R do beg
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