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What are stored and derived attributes?
Stored attributes: The attributes keeps in a data base are known as stored attributes.
Derived attributes: The attributes that are derived from the stored attributes are known as derived attributes.
Differentiate between various levels of data abstraction? Data Abstraction - Abstraction is the procedure to hide the irrelevant things from the users and represent the rele
Explain I command in QBE ? I : It is the command in QBE that is used to insert tuple (s) into the database
Which operator is Cartesian product in relational algebra? Cartesian product in relational algebra is a binary operator. (It requires two operands. e.g., P X Q)
Describe the Association: Design Before we describe association design let us define association "Association is set of links between two objects in the object model". It is
Which data type can store unstructured data? Raw data type can store unstructured data.
Rearrange Classes and Operations Sometimes, the similar operation is defined across different classes and can easily be inherited from a familiar ancestor, but more often oper
Winfield is a small city with a population of 22,000 with buses serves three routes in Winfield and neighboring areas. As the city’s IT director, you have been asked to set up an i
In which format database schema is written ? Data base schema is written in the DDL format.
explain the mapping constraints
what is Lossless-join decomposition
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