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Relational and E-R Model There are three types of constraints on relational database that have: DOMAIN CONSTRAINT PRIMARY KEY CONSTRAINT INTEGRITY CONSTRAINT
Aggregation Aggregation is stronger form of association. It represents the "has-a" or "part-of" relationship. An aggregation association depicts a complex object which is comp
What is transaction? Collections of operations that form a single logical unit of work are known as transactions.
Security: Data not needed by local applications is not stored at the site, therefore no unnecessary security violations may exist. But how can we carry out fragmentation? Fragm
I need to Map an E-R diagram to a relational schema
It is mandatory that for every table in the LDB hierarchy there should exist one GET statement in the report. False. It is not essential.
why are older data models are being replaced by new data models
Use inheritance as an implementation technique when you are going to use inheritance as an implementation technique, you can achieve same goal in a safer way by making one cla
What is a disjoint less constraint? Ans: It needs that an entity belongs to no much more than one level entity set. Disjoint less constraint needs that an entity belongs to
Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
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