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What is a query tree? Ans: A query tree, as well known as operator graph, is a tree data structure that corresponds to a relational algebra expression. It denotes the inpu
In Database software have only pure security or some dis secured by administrator?
what is RDBMS? how it works? good example.
A database will be made to store information about patients in a hospital. On arrival, each patient’s personal details (name, address, and telephone number) are recorded where poss
What is an entity relationship model? The entity relationship model is a collection of basic objects known as entities and relationship between those objects. An
In an E-R diagram how attributes are represented ? In an E-R diagram attributes are represented in a ellipse.
What is a shadow copy scheme? It is simple, but efficient, scheme known as the shadow copy schemes. It is based on making copies of the database called shadow copies that singl
Define access time. Access time is the time from when a read or write request is issued to when data transfer starts.
Using the concepts defined previous, we have identified that strong entities in COLLEGE database are FACULTY, STUDENT, COURSE and DEPARTMENT. This database also has one weak entity
Creating views with check option : This option limits those updates of data values that cause records to go off the view. The following instance tells this in more detail: Examp
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