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What is completeness constraint on generalization? Define the variation between total and partial design constraint. Give an example each.
Ans: Completeness Constraints
1. Total specialization constraint
a. Each entity in the superclass should be a member of some subclass in the specialization for example {HOURLY_EMPLOYEE, SALARIED_EMPLOYEE}
b. Notation: superclass
2. Partial specialization constraint an entity might not belong to any type of the subclasses
For example: {SECRETARY, ENGINEER, TECHNICIAN}
(a) What is a Sub-Query? (b) What is the difference between a scalar sub-query and a tabular sub-query? (c) Write an equivalent SQL statement to get the Name of Product wh
What is first normal form? The domain of attribute must contain only atomic (simple, indivisible) values.
Let us first look into some of the important features of ER model. Entity relationship model is a high-level conceptual data model. It permits us to define the data invo
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
WHAT IS SQL
What is DDL? Make a list of commands with short description used in DDL Ans: Data Definition Language that is abbreviated as DDL is a computer language for defining data struct
#explain five disadvantages of a dbms..
Explain the utilities which help the DBA to manage the database? Every DBA uses database utilities to maintain and control their databases. But there is a lot of confusion wit
projects?
Create an index for the table Client, field CLIENT_NO of Q ? Command: CREATE INDEX client_client_no ON client(client_no);
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