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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 no more than one level entity set. (the meaning of Disjoint less constraint is that an entity can be a member of at most one of the subclasses of the specialization.)
Determine object representation As a designer, we must choose properly that when to use primitive types in representing objects and when to combine groups of related objects,
I want to fragment existing table using java code... help me..!!
The Database Approach In order to overcome the limits of a file system, a new approach was needed. Hence a database approach emerged. A database is a persistent collection of
Adding Redundant Associations for Efficient Access The expression redundant association means using "duplicate association for proficient access". While analysis, it is not a
Explain the term- Query. Queries are used to repossess and show specific records in a table. They can also be used to show specific fields of specific records, which meet the co
Explain the Fundamental concepts of object-orientation Software developers, data base administrators (DBAs) need to be familiar with fundamental concepts of object-orientation.
What are the reasons for having variable length records? What are the various ways to store variable length records? Variable-length records arise in a database in various wa
what do you understand by enhanced entity-relationship
Wait-die" scheme : The idea is based on non-preventive method. It is based on a simple rule: If Ti requests a database resource that is held by T
Consider employee table of (i) and list names of department(s) for which average salary for department is more than 10,000. (SELECT d_name FROM dept WHERE d_code IN (SELECT d_c
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