Developing an E-R Diagram

• Cases 1-3: M:N

PATIENT (PATIENT_ID, PATIENT_LNAME, PATIENT_PHYSICIAN,...)

DRUG (DRUG_ID, DRUG_NAME, DRUG_MANUFACTURER, ...)

PRESCRIBE(PATIENT_ID, DRUG_ID, DOSAGE, DATE…)

PATIENT

DRUG

prescribed

M

N

NOTE: The relationship may have its own attributes.

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