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Give an example of enforcement in Typing.
You can understand the idea of enforcement as it makes sure objects of dissimilar classes may not be interchanged as below:
Example: Fruit f; Vegetable v; Mango m;
This implies 'v' is variables of class Vegetable, 'm' of class Mango and 'f' of class Fruit. Typing ensures that value of 'f' never be assigned to 'v'.
However, if Mango extends Fruits, then 'f' may be assigned a value of 'm'. The variable of a sub class may be assigned to variable of super class, but not other way around while 'm' cannot be assigned a value of 'f'.
Define the Immediate Update The immediate update methods may apply changes to the database on disk before the transaction arrives a successful conclusion. Though, these change
Identify the need and use of data control through problem solving, illustration
Describe queries with complex types? The present extension of the SQL query language deal with the complex type Let us start with the simple example: Find the title and t
i need to submit in this topic.
explaination
Write short notes on relational constraints? Relational Constraints are: 1. NOT NULL 2. Unique 3. Primary key 4. Foreign key 5. Table check
as a customer service employee, explain five measures you would recommend a displeased student to patronise a school canteen
Define the following constraints for the table client. (i) BAL_DUE must be at least 1000. (ii) NAME is a unique key. (i)ALTER TABLE CLIENT ADD CONSTRAINT CLIENT_BAL_DUE_C1
Write a query to define tables students and teachers as sub tables of people? Create table students of student under people Create table teachers of teacher under people
State about the Use Case Diagram A use case diagram represents a set of use cases, actors and their relationships. These diagrams shall be used to model context or requirement
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