Design an ER schema for prescription monitoring based on the given data: Patients are defined by an identity number, a first name and a last name, and by a birth-date. Doctors are defined as well by an identity number, a first name, a last name, and a birth-date, while additionally they will be characterized by a work start date and a specialty. Pharmaceutical companies will be defined by a name, and a telephone number. Medicines will be defined by a commercial name, their manufacturer, and their active ingredient. Pharmacies will be defined by a name, an address and a telephone number. Each patient has one doctor and each doctor has at least one patient. A doctor can prescribe certain medicines to his patients. Each pharmacy sells several medicines, each at a specific price. Each medicine can be sold by several pharmacies possibly at a different price. Pharmaceutical companies have contracts with pharmacies. Each pharmaceutical company may have contracts with several pharmacies. Each pharmacy may have contracts with several pharmaceutical companies. For each contract there is a start date, an end date and the contract contents. For each contract there is always a person responsible for it, which may change at any point while the contract is still in effect. Specify primary key attributes of each entity type and structural constraints on each relationship type. Note any unspecified requirements, and make appropriate assumptions to make the specification complete
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Design an ER schema for prescription monitoring based on the given data:
Patients are defined by an identity number, a first name and a last name, and by a birth-date.
Doctors are defined as well by an identity number, a first name, a last name, and a birth-date, while additionally they will be characterized by a work start date and a specialty.
Pharmaceutical companies will be defined by a name, and a telephone number.
Medicines will be defined by a commercial name, their manufacturer, and their active ingredient.
Pharmacies will be defined by a name, an address and a telephone number.
Each patient has one doctor and each doctor has at least one patient.
A doctor can prescribe certain medicines to his patients.
Each pharmacy sells several medicines, each at a specific price.
Each medicine can be sold by several pharmacies possibly at a different price.
Pharmaceutical companies have contracts with pharmacies.
Each pharmaceutical company may have contracts with several pharmacies.
Each pharmacy may have contracts with several pharmaceutical companies.
For each contract there is a start date, an end date and the contract contents.
For each contract there is always a person responsible for it, which may change at any point while the contract is still in effect.
Specify primary key attributes of each entity type and structural constraints on each relationship type. Note any unspecified requirements, and make appropriate assumptions to make the specification complete.
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