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You are modeling an emergency communication system used to contact teachers in case inclement weather emergencies cause delayed openings or closures of the school. You may reach teachers by phone and/or email. The school must have at least one means of contact (phone or email) for each teacher. Each teacher may have more than one of each contact type. Which type of entity would you use in conjunction with the TEACHER entity to model a teacher's contact information?
You decide to model a CONTACT table with primary key of Teacher-ID and Contact-Info, which is the contact information itself. The school principal, a major stakeholder, tells you she wants to track the area code for each teacher's phone number(s):
Will your original modeling concept work? If not, how would you change the model to reflect the principal's request?
How many entities would you need to represent the unique attributes of telephone numbers and email addresses so that no entity contained null values?
The principal reminds you that every teacher must have at least one phone number, but having an email address is not a requirement.
Where would you reflect the phone number constraint in your model?
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The database should keep track of the date he/she started managing the school. Data stored on each school includes the school’s code, name, address (town, street and postcode) and phone. For the above scenario, you need to perform the following tasks..
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