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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:
what do you understand by enhanced entity-relationship
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crete a data base relationship model Entity: Students; Professors; Dormitories buildings; Attributes of students: Name; Address; Dorm;
why three level architecture had been developed/
Briefly explain each of the following database terms. Use no more than 2-3 lines for each term. 1. DBMS 2. Update Anomaly 3. Alias (referring to tables in SQL queries)
During the deletion of a tuple two cases can happen: Deletion of tuple in relation having the foreign key: In this type of case simply delete the desired tuple. For example, in
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Question: AirwaysCentre, an international airline booking company currently uses a relational database system for their operations, which includes the following relations: P
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