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Assuming that all the tables have been created as given in the relational schema, write SQL code to make the following changes in the structure of the tables:
(i) Make the employee_id the Primary Key of the EMPLOYEES table
(ii) Make the department_id and the manager_id the foreign key of the Employee table assuming that the department_id has been declared as the primary key of the DEPARTMENTS.
(iii) Add a check constraint in the Job_History table so that the end_date will always be greater than the start_date.
(iv) Add a unique constraint in the Employee table so that each employee will have a unique email address.
What does Modularity concept mean? Software architecture embodies modularity; i.e. Software is named in to addressable components called modules, which are integrated finally.
schema tools
Develop a domain model for the Case Study. Express your model with a class diagram, showing any inheritance and compositional relationships. For each of the two selected most es
What is RAD Approach As the term suggests, this model gives a quick approach for software development and is based on a linear sequential flow of numerous development processe
Q. Explain basic information flow model & it's more sophisticated versions? Ans. A Information flow metrics are useful to the components of a system design. For any compone
data dictionary of online banking system
Some Important Steps while doing performing testing The below objectives are to be kept in mind when performing testing: i) It should be done with the intention of finding
State Procedural abstraction. A Procedural abstraction is a named sequence of instructions that has a specific and limited function. Eg: Open Walk to the door, reach out &
After users are authenticated, what measures can be employed in order to maintain security when users are away from their computers? 2. Discuss ways in which the use of strong au
Q. Explain the concept of bottom-up design? Bottom up design: This approach make possible a style of design where we decide how to combine these modules to provide larger ones
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