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What is trigger?
Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
What is Functional Dependency? A Functional dependency is shown by X Y among two sets of attributes X and Y that are subsets of R specifies a constraint on the possible tuple
Answer SQL Queries to extract data from data tables and questions on mapping conceptual data models into relational data model.
Events4Fun is an event management company in Europe with branches in South America as well. The company is well-known for its efficiency, good-quality services, and affordable char
what is the need of a log in dbms
Problem 1 Why are the operational system keys not recommended for forming data warehouse primary keys? Give any two examples 2 Explain the following performance tuning techn
Types of data independence Data independence can be classified into the following two types: Physical Data Independence: This means that for any change made in the physi
How is the database organised in Oracle? Database organized within Oracle in terms of table and table holds attributes and values. A database consists of one or more logical
Define the terms i) Entity set ii) Relationship set Entity set: The set of all entities of the similar type is termed as an entity set. Relationship set: The set of all rela
Increased overheads on update : On the drawbacks side, it will need the system to ensure that all replicas of a relation are consistent. This shows that all the replicas of the rel
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