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What are advantages of object models?
Object models are efficient for communicating with the application experts and reaching a consensus about the significant aspects of the problem. Object models help developers to achieve a consistent, efficient, understandable and correct database design.
One-to-many : An entity in A is related with any number of entities in B. An entity in B is related with at the most one entity in A. Example: Relationship between faculty and d
Question 1 Explain the concept of Foreign Key. How a foreign key differs from a Primary Key? Can the Foreign Key accept nulls? Question 2 With a necessary example explain (i)
DML Precompiler All the DBMS have two basic sets of Languages - Data Definition Language (DDL) that have the set of commands needed to define the format of the data that is b
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Attributes that are directly kept in the data base. For example, 'Birth date' attribute of a person. Derived Attributes that are not stored directly but can be derived
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Why is database redesign necessary? Database redesign is essential for two reasons. First, redesign is essential both to fix mistakes made during the initial database design. S
What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
Define tuple variable Tuple variable is a type of variable whose domain is the set of all tuples.
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