Peter Chen proposed the ERD in as a conceptual modelling tool that system, it may also be used for explaining constraints or business rules. The ERD Diagram for the above scenario can be represented as follows. Write the business rules reflected in attached ERD. Please see the attached file. I am suppose to write the business rules for this ERD. Example 1: 1). Translating Business Rules into Data Model Components. Nouns translate Most popular ERD Notation (very minor differences with our textbook). Part # 2.
Physician ordering the Treatment, treatment date, treatment time, and results.
Entity Type Definitions Patient. A person who is either admitted to the hospital or is registered as an outpatient. Each patient has an identifier, the medical record number MRNand a name.
Physician A member of the hospital medical staff who may admit patients to the hospital and who may administer medical treatments. Each physician has a physician ID and name.
A patient's medical condition diagnosed by a physician. Procedure codes are used for diagnostic and therapeutic procedures.
Each order has an order ID, order date, and order time. In this manner, I was wondering if someone could look at this and derive the same ERD from the business rules I have or if I messed up the translation.
My considerations The specific issue I can not seem to wrap my head around is the existence of multiple relationships between the entity types.
Business Rule for ERD
First of all, I do not even know what kind of cardinalities to put on regarding the relationship between Order and Treatment. Another important feature of a Concert is a Performance, which consists of a performance date Month, Day, Year and time. Each concert typically has more than one performance.Entity Relationship Diagram (ERD) Tutorial - Part 1
We also want to know the paid attendance for a given performance. Many, but not all, compositions have multiple movements.
Business Rule for ERD
During further discussions additional business rules constraints were identified. A concert season schedules one or more concerts.
A particular concert is scheduled for only one season. A concert includes the performance of one or more compositions.
A composition may be performed at one or more concerts, or may not be performed. For each concert there is one conductor. A conductor may conduct any number of concerts performances, or may not conduct any concerts.
Each composition may require one or more soloists, or may not require a soloist. Given the following business rules, create the appropriate ERD.