You are going to be installing a videoconferencing system. One of the requirements of the system is that only workstations that
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Crows Foot ERD of TWo-Bit Drilling Company
- The circumstance is that organization holds the data of representative and protection wards in which a worker can have more than one ward or no ward however all the wards ought to be snared with just a single worker.
- The representative table contains all data of worker and the protection subordinate table contain data of worker's needy.
- A few representatives are examiners which contains the extra information of date of accreditation and confirmation recharging date.
- The EMPLOYEE table contains EMP_NO, EMP_NAME, EMP_DATEHIRED, EMP_TITLE, EMP TYPE and EMP SSN as traits.
- The INSURANCE_ DEPENDENT table contains subordinate EMP_NO, DEPENDENT_NAME, DEPENDENT_DOB and DEPENDENT_RELATIONSHIP (relationship of ward and worker).
- One Employee can be identified with at least 0 Dependents however any Dependent is identified with just a single Employee.
- EMP_TYPE is the subtype discriminator which tells the event of INSPECTOR.
The Attached file Show the Crow Foot ERD
