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Self-Join: In a self join a table is joined with itself. Let consider the following sample partial data of EMP table
EMPNO
ENAME
MGRID
.....
1
Nirmal
4
2
Kailash
3
Veena
Boss
NULL
...
Example: Search the name of each employee's manager name.
SELECT WORKER.ENAME || 'WORK FOR' || MANAGER.ENAME FROM EMP WORKER, EMP MANAGER
WHERE WORKER.MGR=MANAGER.EMPNO;
Output:
Given the subsequent relations: vehicle (reg_no, make, colour) Person (eno, name, address) Owner (eno, reg_no) Write expressions
Can a filed occur in several field groups. Yes. But it leads to redundant data redundancy.
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What is a guard condition? Explain it with a suitable example. The guard-condition is a Boolean expression written with respect to parameters of triggering event and attributes
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What is association? Give an example of association Association is used for establishing relationships among classes. Association describe links among/between classes. For exa
For every multivalued attribute 'A', we make a new relation R that contains an attribute corresponding to plus the primary key attribute k of the relation that shows the entity typ
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Describe different steps of the object-oriented design process. The broad steps of the object-oriented design process are: a. Define context and modes of use of the system
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