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Advantages of Data Distribution
The primary benefit of distributed database systems is the ability to access and share data in a reliable and efficient manner.
What is a super key? A super key is a set of one or more attributes that collectively permits us to recognize uniquely an entity in the entity set.
difference between internal schema and external schema in DBMS
growing phase and shrinking phase are disjoint, why ?
One-to-one relationship: For every 1:1 relationship type R in the ER diagram including two entities E1 and E2 we take one of entities (say E1) preferably with total participatio
What are audit trails? An audit trail is a log of all alters to the database along with information like which user performed the change and when the alter was performed.
Hierarchical
Let consider the given partial relation EMP. Let us make some sub-queries for them EMPNO ENAME JOB SAL DEPTNO 7566
Which two files are used during operation of the DBMS? Data dictionary and transaction log are two files used during operation of the DBMS.
In tuple relational calculus P1 → P2 is equivalent to ? A In tuple relational calculus P1→ P2 is equivalent to ¬P1 V P2. (The logical implication expression A B, meaning
Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
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