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What is conceptual schema?
The schemas at the view level are known as subschema that describe dissimilar views of the database.
An entity type usually has an attribute whose values are distinct for every individual entity in the collection. Such an attribute is known as a key attribute and its values can be
read-set(T) : Each data items that are read by a transaction T Timestamps : for all transaction T, the start-time and the end time are reserved for all the three phases.
What are the comparison operator in SQL? Comparison operator in SQL are =, LIKE and BETWEEN
State the functional approach of object oriented methods Moving from a functional approach to an object oriented one needs a translation of functional model elements into objec
Define a property that is not a property of transactions? Ans: Concurrency is not a property of transactions
Entity types that do not have any key attribute, and therefore cannot be identified independently, are known as weak entity types. A weak entity can be recognized uniquely only by
Chapter 10a review questions
Convert the following ER - diagram (Entity Relationship Diagram) into a relational database (the primary keys are underlined): Ans: The relational database schema f
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
What is a relationship called when it is maintained between two entities? A relationship is called Binary relationship when it is maintained between two entities.
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