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Define null values. In some cases a certain entity may not have an applicable value for an attribute or if we do not know the value of an attribute for a certain entity. In the
Determine the Disadvantages of file based systems Some of the disadvantages of file based systems are like this: Data redundancy and inconsistency: the dissimilar applic
What are the technique to define a schema completely ? A schema is completely define by DDL and DML query language.
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, write the relational schema, and draw the new dependency diagrams. Identify the normal forms for each table structure you created
Demonstrate the Design of associations During object design phase we must design a strategy to implement associations. Association may be unidirectional or bi-directional. Wha
Explain What is Relation? A database relation is a predefined row or column format for storing information in a relational database. Relations are equal to tables.
During the deletion of a tuple two cases can happen: Deletion of tuple in relation having the foreign key: In this type of case simply delete the desired tuple. For example, in
What is trigger Triggers are statements that are implemented automatically by the system as the side effect of a change to the database.
An orchestra database consists of the following relations: CONDUCTS (conductor, composition) REQUIRES (composition, Instrument) PLAYS (Player, Instrument) Give the relational
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